**GROS TALON = GENOU DÉTRUIT / La vérité sur l'amorti — Transcript & Summary | SozAI** Source: https://sozai.app/transcript/gros-talon-genou-detruit-verite-amorti/ Thick cushioned running shoes may harm knees by altering stride and increasing joint stress despite their comfort and shock absorption claims. ## Key Takeaways - Thick cushioned heels encourage heel striking that increases knee joint stress and injury risk. - Shock absorption by cushioning is limited; biomechanics and muscle function are critical for joint protection. - Repeated heel strikes with a straight leg damage knee cartilage, which heals poorly. - Running shoe design is influenced by market demands rather than optimal biomechanics. - Gradual transition and strengthening are essential when moving to less cushioned footwear. ## What the video covers - Modern running shoes often feature thick, cushioned heels intended to protect joints by absorbing shock. - These thick heels promote a pronounced heel strike, causing the foot to land with a straight leg and knee nearly extended. - A straight leg heel strike transmits high impact forces directly to the knee joint, creating shock waves through the skeleton. - Muscles cannot absorb shock effectively when the knee is straight, leaving cartilage to bear excessive load. - Repeated impact damages knee cartilage, which has limited regenerative capacity, leading to long-term joint issues. - Heel striking also generates braking forces that increase shear stress on the knee, compounding injury risk. - The running shoe industry favors thick cushioning for marketing and short-term injury prevention, despite long-term biomechanical downsides. - Transitioning to minimalist or lower-drop shoes requires gradual adaptation to strengthen foot muscles and avoid injury. - Proper running biomechanics involve landing with a bent knee and flatter foot placement to reduce joint stress. - Ultimately, strong muscles and good technique are more protective than cushioning alone. ## Chapters 1. 00:00 Introduction to Thick Running Shoe Soles 2. 01:53 Impact of Heel Height on Foot Strike 3. 03:35 Physics of Impact Forces on the Knee 4. 05:40 Braking Forces and Knee Stress 5. 07:46 Muscle Development and Shoe Choice 6. 09:48 Benefits of Proper Foot Strike and Transition 7. 13:48 Research Findings and Running Economy 8. 19:40 Summary and Recommendations for Runners Answers ## Questions about this video Why do thick cushioned running shoes increase knee injury risk? Thick cushioned shoes promote a heel strike with a straight leg, which transmits high impact forces directly to the knee joint, causing shock waves and shear stresses that damage cartilage over time. Can cushioning fully protect my joints when running? No, cushioning absorbs some shock but cannot counteract the mechanical forces caused by heel striking with a straight knee. Muscle function and proper biomechanics are essential for joint protection. How should I transition to minimalist or less cushioned running shoes safely? Transition gradually to allow your foot and ankle muscles to strengthen and adapt, preventing injury. Sudden changes can overload unprepared structures, so a progressive approach is crucial. ## Full Transcript — Download SRT & Markdown 00:01 Speaker A You know, when you walk into a running shoe store these days, you’re immediately struck by something. The soles are huge, aren’t they? Some are a good 3 or 4 cm thick under the heel. 00:14 Speaker A They almost look like platform shoes from the 70s. And the salesperson convincingly explains to you that this is precisely what will protect your joints, that all this cushioning will absorb shocks, and that you’ll be running on cloud nine. Except that the 00:30 Speaker A reality is much more complex than that. And what we’re going to discover together today is that these big, thick, soft heels, as comfortable as they may seem at first glance, can actually profoundly change the way you run and 00:44 Speaker A create significant mechanical stress on your knees. It’s a bit paradoxical, isn’t it? We buy shoes that are supposed to protect us, and they end up exposing us to injuries. So, let’s start at the beginning. What exactly happens when you run in shoes with 01:01 Speaker A thick heels? To understand this, we first need to talk about the stride. The stride is the complete cycle that goes from the moment your foot leaves the ground to the moment it comes back down. And in this cycle, there is a 01:16 Speaker A crucial moment, absolutely determining for everything else: the strike, the very first contact between your foot and the ground. This is where everything happens. Now, imagine that you are wearing shoes with a very thick and very padded heel. What will 01:32 Speaker A naturally happen? Well, your foot will tend to land by striking with the heel. And not just a little bit. We are talking about a really marked, really pronounced heel strike. Why? Because all this thickness under the heel creates what is called a significant 01:48 Speaker A drop, that is to say a difference in height between the back and the front of the foot. 01:53 Speaker A Your heel is perched at a high altitude, so to speak, and so mechanically, it will be the one that will touch the ground first. Now, you're going to say, "So what's the problem? After all, there's a lot of cushioning, it should 02:04 Speaker A absorb the shock, right?" That's where it gets interesting. And that's where shoe manufacturers might be telling you a story that's a bit too simple. 02:11 Speaker A Because yes, cushioning absorbs some of the shock, that's true, but it can't absorb everything and, most importantly, it can't do anything against the laws of physics. When your heel hits the ground first, especially if it does so 02:23 Speaker A with some force because you have this big cushion that gives you a false sense of security, something very special happens. Your leg is in a very specific position at that moment. It's practically straight, your knee is almost fully extended, and that's really 02:38 Speaker A the heart of the problem. Imagine for a moment that you hit something with a rigid stick. All the force of the impact is going to be propagated along the stick, right? Well, that's exactly what happens to your leg when you 02:51 Speaker A strike with your heel and your knee straight. Your leg becomes like a rigid lever, a nearly straight column, and all the force of the impact is going to travel upward. It goes up from your heel, through your ankle, along your 03:05 Speaker A shin, and bang, it goes straight into your knee joint. And after your knee, it continues down to your hip and even up your spine. This is called a shock wave. You literally create a little shock wave that goes through your 03:21 Speaker A entire skeleton with every step. Now, let's talk a little bit about basic physics because it's important to understand the high stakes. When you run, every time your foot hits the ground, your body experiences a force that's about two to three times your 03:35 Speaker A body weight. If you weigh 150 pounds, that means your foot is taking 300 to 400 pounds with each impact. That's huge. And if you strike with your heel and your leg straight, all that force has to be managed by your joints, not 03:51 Speaker A your muscles. Because at that point, your muscles can't really work efficiently. To absorb a shock, a muscle must be able to contract eccentrically, that is, lengthen while resisting. But for that to happen, the joint must be slightly flexed. If your 04:10 Speaker A knee is practically straight at the moment of impact, your quadriceps and hamstrings can't play their role as muscle shock absorbers. As a result, the cartilage in your knee takes all the brunt of the load. And that's where we really get to the crux of the 04:23 Speaker A problem. Articular cartilage is the smooth, shiny tissue that covers the ends of your joints. Its job is to allow smooth sliding between the bones and to distribute the load. But it's not made to withstand repeated, brutal shocks. 04:39 Speaker A It's made to handle progressive compression and fluid movement. When you repeatedly send shock waves to it several thousand times per running session because you take several thousand steps, well, it starts to suffer. It compresses excessively, it can develop micro-lesions, it can wear 04:57 Speaker A out prematurely, and once the cartilage is damaged, it does not regenerate or regenerates very little. It is an avascular tissue, meaning that it has no blood vessels to supply nutrients and allow for repair. So each time you damage it, you lose a little more 05:14 Speaker A health capital for your knees. But wait, that's not all. There is another really crucial mechanical aspect that you need to understand. When you strike with your heel with a straight leg, you create what is called a braking force. 05:27 Speaker A Imagine that you are moving forward, your body is moving forward at a certain speed. And then, you place your foot in front of you, heel first, with your leg straight. What happens? You literally plant your heel in the ground 05:40 Speaker A in front of your center of gravity. It's as if you're braking with each step. This braking force opposes your forward movement and therefore needs to be compensated for. And who compensates? Your joints once again, and in particular your knee. This force 05:56 Speaker A creates a torsional moment, a shear stress at the joint. This is additional mechanical stress that is added to the vertical shock wave we were talking about earlier. You're starting to see the picture. With each step you take with a pronounced heel 06:11 Speaker A strike favored by your thick, high-heeled shoes, you're sending a double whammy to your knees. On the one hand, a vertical shock wave that goes up your leg. On the other, a horizontal braking force that creates shear stresses. And you repeat this between 06:27 Speaker A 5,000 and 10,000 times during an hour of running. Multiply that by the number of times you run in a year. You can see why so many runners develop knee problems. We're talking about patellar tendonitis, patellar syndrome, meniscus problems, early osteoarthritis. 06:46 Speaker A Sometimes all of this is often linked to this problematic stride mechanics. Now, you might be asking me, "But why do shoe manufacturers continue to make models with thicker and thicker heels if they know all this? That's an excellent question." 07:00 Speaker A The answer is a bit complex. First, you have to understand that the running shoe industry is a huge market, worth several billion euros. And in this market, there is a race for innovation, marketing, and novelty. Every year, each brand has to come out with new 07:15 Speaker A models with new technologies. And cushioning, high-tech materials, 4 cm thick soles, all of that sells well. It looks modern, it looks protective, it reassures the consumer, it's tangible, you can see it, touch it in the store. 07:31 Speaker A You think to yourself, "Look at all the cushioning, my joints are going to be protected." But there's also another factor. Many people, especially beginners or occasional runners, have foot and ankle muscles that aren't very well developed. We spend our lives in 07:46 Speaker A stiff, cushioned shoes. Our feet aren't really used to working anymore. So, when these people try to run, if you immediately put them in minimalist shoes with very little cushioning and a low drop, they risk getting injured because their structures aren't ready. 08:02 Speaker A Manufacturers know this, and they prefer to offer shoes with a lot of protection to avoid injuries in the short term. 08:09 Speaker A The problem is that in the medium and long term, these shoes encourage biomechanics that 08:24 Speaker A difference in height between the rearfoot and the forefoot. A traditional shoe often has a drop of 10 to 12 mm. This means that your heel is perched 10 to 12 mm higher than your toes. That's huge when you think about 08:39 Speaker A it. Stand barefoot and try to imagine raising your heels more than 1 cm. Do you feel how this completely changes your posture and balance? Well, that's exactly what happens in your high-drop running shoes. Your posture is changed, your center of gravity is shifted 08:58 Speaker A slightly forward, and most importantly, you are mechanically encouraged to strike with your heel because it's the lowest part, closest to the ground when you move your leg forward. Conversely, imagine a shoe with a drop of 4 mm or 09:11 Speaker A even zero. Here, your foot is much flatter. Your posture is more natural, closer to what it would be if you were barefoot. And in this position, it becomes much more difficult, if not impossible, to strike violently with your heel. You will naturally tend to 09:30 Speaker A place your foot more flat or even strike with your midfoot or forefoot. And that changes everything in terms of biomechanics. When you strike with your midfoot or forefoot, your foot lands below your center of gravity or just slightly forward. Your knee is bent at 09:48 Speaker A the moment of impact and everything happens differently. First, you no longer create that braking force that we were talking about. On the contrary, your foot accompanies the forward movement. Second, and this is really crucial, your muscles can work. Your 10:05 Speaker A arch acts like a natural spring. It flattens slightly to absorb the shock. Your ankle flexes. Your knee, which is already slightly bent, can bend even more, and your quadriceps and hamstrings work eccentrically to control this bending and absorb the 10:22 Speaker A energy. Even your hip participates in the shock absorption. Basically, instead of having a rigid leg that transmits all the force to the joints, you have an entire muscle chain that comes into play to manage the shock. 10:36 Speaker A It's like the difference between jumping off a chair and landing with your legs straight versus landing with your legs bent. Try it at home and you'll see. If you land with your legs straight, you immediately feel an unpleasant jolt that travels up through 10:48 Speaker A your body. It hurts. If you land with your legs bent, the impact is much softer and more controlled. It's exactly the same for running. A stride with a heel strike and legs straight is like landing with your legs straight 11:01 Speaker A with each step. A stride with a midfoot strike and knees bent is like landing with your legs bent. It's simple, but it's essential. Now, I can already hear some of you saying, “Okay, but if I remove all this cushioning and switch 11:14 Speaker A to shoes with a low drop, won’t I risk hurting myself elsewhere?” That’s a very good question, and the answer is worth exploring. Yes, indeed, if you suddenly switch from maximalist shoes with a 12 mm drop to minimalist shoes with zero drop, you risk injuring 11:30 Speaker A yourself. But not your knees, specifically. Instead, you risk developing problems with your Achilles tendon, calf, or plantar fascia. Why? 11:43 Speaker A Because these structures that haven’t really worked for years in your cushioned shoes will suddenly have to deal with stresses they’re not prepared for. That’s why the transition is absolutely essential. You don’t change paradigms overnight. If you want to switch to shoes with less 12:00 Speaker A cushioning and a lower drop, you have to do it gradually over several months or even a year. You need to start with foot and ankle strengthening exercises. 12:10 Speaker A Proprioception exercises to re-teach your body how to manage balance and constraints. You may need to start by walking barefoot at home, doing some training runs in minimalist shoes, just 5 or 10 minutes at first, then gradually increase the volume. It's a 12:28 Speaker A process of adaptation and strengthening . You need to rebuild muscles, tendons, and structures that have been underused for a long time. And that's where we get to a deeper truth about running and our relationship with technology in general. We often look for external, 12:45 Speaker A technological solutions to problems that are actually problems of biomechanics, technique, or physical condition. We tell ourselves, "My knee hurts, I'm going to buy shoes with more cushioning." But in fact, maybe the real problem is that your stride isn't 12:59 Speaker A adapted, your muscles aren't strong enough, or your running technique isn't good. And instead of working on these fundamental aspects, we add a layer of technology that may provide short-term relief, but in the long term can make the problem worse by locking you into 13:15 Speaker A bad posture. It's a bit like if you had back pain due to poor posture at the office and instead of correcting your posture and strengthening your back muscles, you just took anti-inflammatories every day. It masks the symptom but doesn't solve the cause 13:32 Speaker A . And with your complexion, the problem gets worse. It's the same for running. Big, cushioned shoes are like an anti-inflammatory that masks the symptom without treating the root cause . So what's the solution? Should we all run barefoot like our ancestors? No, 13:48 Speaker A not necessarily. The solution lies in nuance, in understanding your own biomechanics and in a progressive approach. The important thing to understand is that cushioning itself is not the problem. The problem is cushioning that is thick, too soft, and 14:04 Speaker A combined with a high drop that encourages a hard heel strike. Cushioning can be protective if it is well-designed, if it is firm enough to give you proprioceptive feedback—that is, so that you can feel the ground and your body can adapt its mechanics 14:19 Speaker A accordingly—if it is not too thick that you feel stable, and, most importantly, if it is combined with a low to moderate drop that encourages a midfoot strike rather than a heel strike. There was a whole movement in the 2010s around minimalist running, or 14:35 Speaker A barefoot running. Many people have read the book Born to Run, you may be familiar with it, which tells the story of the Taraumara Indians in Mexico who run ultra marathons in rudimentary sandals. This book has inspired thousands of runners to ditch their big 14:50 Speaker A shoes and try barefoot running or nearly barefoot running. And there have been some amazing success stories, people who have solved chronic injury problems by completely changing their approach. But there have also been a lot of injuries because people have 15:03 Speaker A gone too fast, too hard, without taking the time to transition. The important thing to remember about this movement is not that you absolutely have to run barefoot, it's that you have to run with good biomechanics, and for some, 15:15 Speaker A maybe many, traditional shoes with big heels don't promote good biomechanics. The truth is probably somewhere in the middle. Shoes with reasonable cushioning that's firm and responsive. 15:29 Speaker A A moderate drop of 4 to 6 mm, for example, that offers some protection while still allowing your body to move naturally and your muscles to do their work. Now let's talk about the scientific studies because it's important not to just tell stories, we 15:44 Speaker A need evidence. And there’s been quite a bit of research on these issues in recent years. Studies have measured impact forces on the knee based on gait pattern, and the results are pretty clear. When you strike with your heel, 15:59 Speaker A the peak force applied to the knee is significantly higher than when you strike with your midfoot or forefoot. 16:06 Speaker A We’re talking about differences that can range from 20 to 40%depending on the study. That’s huge. Imagine if you could reduce the stress on your knees by 20 to 40%just by changing the way you strike your foot. Other studies 16:21 Speaker A have looked specifically at the effect of shoe drop on biomechanics. And there again, the results are interesting. 16:30 Speaker A Researchers have found that with high-drop shoes, runners tend to strike more with their heels, have a smaller knee flexion angle at impact, and generate higher peak forces. Conversely , with low-drop shoes, runners tend to strike more with the midfoot, have more 16:48 Speaker A knee flexion, and have lower peak forces. This confirms exactly what we were explaining earlier on a theoretical level. Now, there are also studies that have looked at injury rates. And here, it's a bit more complicated because running injuries 17:03 Speaker A depend on so many factors. Your training volume, your injury history, your body type, your technique, your footwear, your running surface, your recovery, even your diet. It's difficult to isolate the effect of a single factor. And what we can say is 17:24 Speaker A that some studies have found that runners who use minimalist or low-drop shoes tend to have fewer knee injuries, but sometimes more foot and ankle injuries, especially if they haven't made a gradual transition. This goes back to what we were saying: it’s not 17:40 Speaker A magic, you have to adapt. There’s also the whole issue of running economy . Running economy is basically the amount of energy you expend to run at a given speed. The more economical you are, the less oxygen you consume, the 17:53 Speaker A less fatigue you get, and the better your performance. And here, studies show that running with a midfoot or forefoot strike can be more economical than running with a flat strike. Why? 18:05 Speaker A Because you make better use of the natural elasticity of your tendons and muscles. When you strike with the forefoot or midfoot, your Achilles tendon and the arch of your foot behave like springs. They store elastic energy during the impact phase and release it 18:21 Speaker A during the propulsion phase. It’s a bit like a kangaroo bouncing. Conversely, when you strike with your heel with your leg straight, you lose this elastic energy. The impact is more brutal. Energy is dissipated as heat instead of being returned. You see, 18:37 Speaker A everything is connected. Biomechanics, injuries, performance, it all forms a coherent system. And at the center of that system is the way your foot makes contact with the ground. That's really where everything starts. And your shoes , the design of your shoes, directly 18:54 Speaker A influences that first contact. Now, I want to be clear about one thing. I'm not saying that everyone should throw away their cushioned shoes and run minimalistically. That would be irresponsible of me and it would be wrong. There are people for whom shoes 19:09 Speaker A with more cushioning are appropriate, at least temporarily. If you're significantly overweight, if you're coming back from an injury, if you're a total beginner with very weak musculature, maybe shoes with some level of protection are necessary at first. The important thing is to 19:26 Speaker A understand the trade-offs, understand the biomechanical effects, and have a medium-term plan to move toward something more natural. What I’m saying is that we need to get away from the idea that more cushioning equals more protection. It’s not that simple 19:40 Speaker A . Thick, soft cushioning can give you a false sense of comfort and security when in reality it alters your stride in potentially damaging ways. It encourages you to strike with your heel . It reduces your proprioception. It prevents you from effectively using 19:56 Speaker A your natural cushioning structures, which are your muscles and tendons. And ultimately, it can increase stress on your knees rather than decrease it. The ideal solution is probably what we might call intelligent cushioning, cushioning that is firm enough to give 20:11 Speaker A you feedback, so that you can feel the ground. Cushioning that is not too thick so that you maintain stability and a connection with the terrain, and most importantly, a moderate to low drop that doesn’t force your foot into an unnatural position. You want a 20:27 Speaker A shoe that supports your natural biomechanics, not a shoe that dictates it. And then beyond the shoe, you need to work on your running technique. 20:36 Speaker A Learn to land your foot under your center of gravity, not in front of it. 20:40 Speaker A Learn to increase your cadence because a higher cadence of around 180 steps per minute naturally promotes a shorter stride and a mid-foot strike. Learn to stay light on your footing, to avoid impacting the ground. You need to imagine that you are running on eggs 20:55 Speaker A and you don't want to break them, or on hot coals and you don't want to burn yourself. This mental image can really help you change your technique. There is also all the muscle strengthening work that is essential. Exercises for 21:08 Speaker A the calves, for the muscles of the foot , for the hip stabilizers, squats, lunges, proprioceptive work on one leg. 21:16 Speaker A All of this will strengthen your muscle chain and allow your body to better manage the stresses of running. Because ultimately, your best shoes are your muscles. Shoes are just a tool, a complement. They can’t replace good physical condition and good technique. 21:31 Speaker A I also want to mention that there are significant individual differences. Some people have anatomy that naturally favors a heel strike. Perhaps because of the length of their legs, the angle of their hips, the stiffness of their Achilles tendon. For these people, 21:45 Speaker A trying to force a forefoot strike can be counterproductive. The idea is not to impose a universal dogma, but to understand the biomechanical principles and adapt them to your own body. Maybe for you, the optimum is a slight heel 21:59 Speaker A strike with a well-flexed knee and a 6 mm drop. For someone else, it will be a midfoot strike with a 4 mm drop. The important thing is to minimize the stress on your joints while respecting your anatomy and your current abilities 22:14 Speaker A . And then there's the issue of terrain . On soft terrain like a forest path or a dirt track, heel strike is less of an issue because the ground itself absorbs some of the shock. It's on hard surfaces, like asphalt or concrete, 22:29 Speaker A that the impact is most violent and that biomechanics become really crucial . So if you mainly run on roads, it's even more important to pay attention to your stride and your footwear. Another interesting dimension is the cultural and historical aspect. For millions of 22:46 Speaker A years, our ancestors ran barefoot or with minimal protection. The human body evolved to run this way. The first modern running shoes with thick, cushioned soles date back to the 1970s, barely 50 years ago. This is a very recent innovation in terms of human 23:03 Speaker A evolution. Has it improved things? Paradoxically, epidemiological studies show that the injury rate among runners has not decreased with the arrival of high-tech shoes. It has remained more or less stable, at between 30 and 50%of runners getting injured each year. This 23:20 Speaker A should give us pause. We have invested billions in research and development of increasingly sophisticated shoes. And yet, we are not running any better and we are not getting injured any less. 23:32 Speaker A Maybe we have taken the wrong direction . Maybe instead of adding more and more cushioning, more and more control, more and more technology, we should go back to something simpler, more natural. Let the body do what it knows how to do, 23:46 Speaker A which is to adapt, strengthen itself, and prove its balance. And for that, we need shoes that interfere as little as possible with natural biomechanics, not shoes that try to compensate for all our weaknesses. Of course, I understand that this is difficult. When you’re 24:03 Speaker A in a store and they show you two models , one with 4 cm of ultra-comfortable foam and the other with a thin, firm sole, you’re immediately drawn to the first one. It seems so much more comfortable, so much more protective. 24:17 Speaker A But immediate comfort doesn’t always translate into long-term benefits. Sometimes, what seems comfortable is actually what locks you into a bad position. It’s a bit like a chair that’s too soft and you sink into it. At the moment, it 24:32 Speaker A feels good, but after an hour, your back hurts because you have no support. Well, shoes that are too soft are the same. For the first few meters, they’re uncomfortable. But after a few kilometers, your knees pay the price. So how do you make the right 24:45 Speaker A choice? First, find out about the drop. This information is usually available on the manufacturer’s website or on the label in the store. If you’re used to high-drop shoes like 10-12 mm, consider gradually moving to mid-drop models like 6-8 mm, and then maybe 25:04 Speaker A after a few months to low-drop models like 4mm or 0. But really do it gradually, don’t change everything at once. Next, pay attention to the firmness of the cushioning. You can have cushioning that’s generous in volume, but still firm and responsive. 25:22 Speaker A That’s interesting. What you want to avoid is the kind of cushioning that’s like a tramou, the kind where your foot sinks into like a squish. 25:30 Speaker A When you try on a shoe, bounce around a bit. You should feel a response, a bounce. If you feel like you’re sinking into soft sand, that’s not a good sign. Also, look at the width of the sole. Some maximalist shoes have 25:44 Speaker A soles that are so wide and thick that it affects your stability. You’re perched high up, like walking on miniature stilts. It increases the risk of twisting your ankle and disrupts your proprioception. Opt for soles that are reasonably wide and high, and 26:01 Speaker A listen to your body. This is really the most important piece of advice. If you change shoes and you start to have new pains, whether in your knees, ankles, or feet, it's a sign. Don't ignore it. 26:15 Speaker A Maybe you're going too fast in the transition. Maybe you need to strengthen certain structures first. 26:22 Speaker A Maybe this particular model isn't right for you. Every body is different, and there's no one-size-fits-all solution. 26:29 Speaker A You can also film your stride. Nowadays , with a smartphone, it's easy. Ask someone to film you from the side while you're running on a treadmill or on a road. Watch how your foot lands. Are you really striking with your heel and 26:44 Speaker A with your foot far in front of your body? Is your knee straight at impact? 26:51 Speaker A Where do you land your foot flatter under your body with your knee bent? This visual analysis can be very revealing and if you identify any issues, you can consciously work on them during your training. There are also sports podiatrists, specialized 27:08 Speaker A physiotherapists, and running coaches who can help you. Professional gait analysis with high-speed cameras and force plates can really give you valuable insights into your biomechanics. It’s not cheap, but if you run regularly and want to avoid long-term injuries, it can be a 27:26 Speaker A worthwhile investment. In summary, and this is really the central message I want you to take away, a thick, cushiony heel is not necessarily your friend. It may feel comfortable, it may be well marketed, it may look high-tech and sophisticated. But it changes your 27:43 Speaker A gait in subtle but profound ways. It encourages you to strike with your heel , which creates shock waves that travel up to your knee and beyond. It turns your leg into a rigid lever instead of letting your muscles do their natural 27:57 Speaker A shock absorber job. And ultimately, it can contribute to overloading your knees and promoting long-term injuries. 28:05 Speaker A The solution is not to throw everything away and run barefoot overnight. It is to understand these mechanisms, to choose shoes with reasonable and firm cushioning, a moderate drop and, above all, to work on your running technique and muscle strengthening. It is a 28:20 Speaker A comprehensive, progressive and intelligent approach. You must see your shoes as one tool among others, not as a miracle solution. The real work is done with your body, with your muscles, with your brain, which learns better coordination and perhaps in a few 28:35 Speaker A months or years, you will be running in much more minimalist shoes than the ones you are wearing today. You will feel more connected to the ground, lighter, more fluid. Your knees will thank you. Your running economy will improve. You will enjoy running more 28:52 Speaker A because you will move more naturally and harmoniously. It is a journey, an evolution. And like any journey, it requires time, patience, and perseverance. But it is definitely worth it because in the end, running should be a pleasure, not a source of 29:06 Speaker A pain. And for it to be a lasting pleasure, you have to respect your body , understand how it works, and give it the optimal conditions to express itself. Your knees are part of this body. They work hard with every step. 29:20 Speaker A So, give them a chance to do their job well by starting by choosing shoes that do not overload them unnecessarily. Topics: running shoes heel strike knee injury cushioning running biomechanics shock absorption minimalist shoes joint stress running technique foot strike pattern Study this video - [Flashcards from this video](https://sozai.app/tools/ai-flashcard-generator/?from=transcript&id=75569) - [Quiz on this video](https://sozai.app/tools/quiz-generator/?from=transcript&id=75569) Free, made by AI from this transcript. No signup. --- This is the markdown twin of https://sozai.app/transcript/gros-talon-genou-detruit-verite-amorti/ — the same content, without the markup. Published by SozAI (https://sozai.app). Reuse and quotation are allowed with attribution and a link back. Machine-readable index: https://sozai.app/llms.txt · data API: https://sozai.app/api/