Shoes Vs. Muscles, The Real Reason Your Running Isn't Improving

Running performance isn’t always about better gear — sometimes the real limiter is your body, not your shoes.

In this episode of The Runner’s Sole Podcast, Sharon Miller explores one of the most common debates among runners: Do you need new running shoes, or do you need stronger muscles?

From beginners to experienced marathoners, many runners assume slower pace, fatigue, or discomfort means it’s time to upgrade footwear. But Sharon breaks down the science behind running performance and explains why muscle strength, endurance, and efficiency often matter far more than what’s on your feet.

This episode challenges popular running myths while offering practical guidance on how strength training, consistency, and smart habits can dramatically improve performance and reduce injury risk.

You’ll learn how to shift your focus from equipment to efficiency — and build a stronger foundation for better running long-term.

🎧 IN THIS EPISODE YOU’LL LEARN:

✅ Why running shoes improve comfort but rarely determine performance
 ✅ The real role muscle strength plays in running efficiency
 ✅ How weak glutes, calves, and core muscles affect your stride
 ✅ Why muscle endurance — not footwear — often causes fatigue
 ✅ The difference between equipment upgrades and body adaptation
 ✅ How strength training improves running economy and reduces injury risk
 ✅ When shoes truly matter (and when they don’t)
 ✅ The psychological trap of blaming gear instead of habits
 ✅ The five priorities every runner should focus on for improvement

👣 WHY THIS EPISODE MATTERS

Many runners chase performance through new shoes, advanced technology, or the latest trends — but lasting improvement comes from building a stronger, more resilient body.

By focusing on strength, consistency, mobility, and recovery, runners can improve efficiency, prevent injuries, and enjoy more sustainable progress. This episode helps you understand where your real performance gains come from — and how to train smarter rather than simply buying better gear.

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🏃 ABOUT THE PODCAST

The Runner’s Sole Podcast is where running meets science, stride by stride.

Hosted by podiatrist and runner Sharon Miller, the show helps runners understand foot health, prevent injuries, and build sustainable running habits — especially for those managing diabetes while staying active.

Transcript

SPEAKER_00 0:08

Welcome back to The Runner Soul, a podcast where we break down the science, the myths, and the mindset behind better running. I'm Sharon, your resident podiatrist, runner, and unapologetic research. Today's topic is one that sparks debate among runners of all levels. And that's from beginners to marathons to veterans. And that's the subject of what really holds you back. And I'm gonna ask the question: is it your running shoes or is it your muscle tone? Alright, so I want to start today with a question that might hit a little too close to home. Have you ever finished a run, looked down at your shoes, and thought, hmm, yeah, it's probably time for a new pair. That's obviously the problem. Be honest, we've all done it. And hey, I'm not judging. It feels logic, right? New shoes, better running. Expensive shoes, better running. But no, it's not the case. Because today we're going to have a slightly uncomfortable conversation. And I'm gonna ask you, what if it's not your shoes at all? What if it is your muscles? If you've ever blamed a slow run on worn-out trainers or wondered if you just don't have the legs for speed, then this episode is definitely for you. Let's dig in. Judge and jury time. So the case against your shoes. So let's talk about them first, because they always seem to be the prominent thing for runners. So before we start blaming your glutes for everything, let's give shoes their moments. Let's start with the obvious suspect, your running shoes. Shoes do matter. If you're running in something that's completely worn out, it doesn't fit properly, just feels uncomfortable, or they are as old as the hills, and you're trying to get your money's worth out of them. Yes, that's definitely going to affect your running. You might feel sluggish, get aches, or just not enjoy your runs as much. But here's the thing, most people don't realize. Shoes are more about comfort and injury prevention than actual performance. Yes, you're right. They're not going to magically make you faster. Like you could go out and buy the exact same pairs of shoes that the elite runners wear. And you are going to perform just the same as if you were wearing your old trainers. Modern running cultures put a lot of emphasis on footwear, and of course, they make big books, carbon plates, maximum cushion, stability systems. It can feel like performance lives or dies by what's on your feet. And to be fair, of course, shoes do matter. Poor footwear can increase your injury risk, reduce your running efficiency, and cause discomfort that limits your training consistency. And I'll give you a few examples. Worn out mid-sole loose their shock absorption. So if they're all loose and a bit worn, they're just not going to give you that shock absorption that you need. And so all that impact goes back into your body. Also, ill-fifting shoes can alter your gait. So if you've got any little aches and pains, you'll you'll walk differently to avoid the discomfort. And overly cushioned shoes may reduce ground feedback and stability for some runners. But here's the truth, most people don't want to hear. Shoes are rarely the primary limiter of performance. And that is the truth. They can enhance or hinder, but they don't build fitness. You can't buy endurance, you can't upgrade your aerobic base. And that brings us to the real contender. Alright, guys, this is where it gets real. Because when runners say I just feel slow, or I can't hold my pace, what they're often really experiencing is muscle fatigue. Not a shoe problem, but a body problem. Think about your last tough run. Was it really your shoes that gave up? Or was it those legs feeling heavy? Your stride getting sloppy? Or your posture collapsing? That's muscle endurance, and that's strength, and that is control. So when we talk about muscle tone and running, we're really referring to several things. Most importantly, strength, muscle endurance, neuromuscular coordination, elasticity, and stiffness in tendons. And these are huge performance drivers. So weak or undertrained muscles can lead to early fatigue, inefficient stride mechanics, per postulated runs, and increased injury risk. Which, of course, is not what we want. So here's a simple way to think about it. Your body is the engine. Your shoes, they're just the tires. And listen, and nice tires are great. But if the engine is underpowered, the car's not winning any races, your heart and lungs must be ready to go. But if your legs can handle load, your pace drops. And compensation equals wasted energy, which equals slower running. So common weak links for runners. Well, let's talk about the usual culprits. Definitely those weak glutes. That's a huge one. Tighter underpowered calves are calves that have no shape to them. You know, those legs that are just up and down. So let's compare efficiency versus equipment. And we'll do that by comparing two runners. So we have runner A, who has top-tier shoes, weak glutes, and poor stride mechanics. Then we have Runner B. Runner B has average shoes, strong, well-conditioned muscles, and efficient movement hearts. Now who do you think will win? A or B? Well, runner B will almost always win. And why is that? I hear you ask. Because here's something a lot of runners don't realize. You don't just get faster by running more, you get faster by becoming more efficient. Efficiency is the key. And that means using less energy at the same pace, holding good form when you charge, and pushing off the ground with more power. And that comes from, yes, you guessed it, stronger muscles. Because running isn't fundamentally a movement skill, it's not a gear dependence activity. Your body is the engine, your shoes are just the tires. And even the best tires won't help if the engine is underpowered. And this is where many runners fall short. They don't put enough emphasis on the hidden role of strength training. They'll run more to get better at running, but neglect strength training. And here's what proper strength work does for you and your body. Well, firstly, it improves force production. You push off the ground more powerfully and easily and quickly. It enhances your running economy so you use less energy at the same pace. It reduces your injury risk and delays fatigue. Even just two sessions per week can dramatically improve performance. And these key exercises have to include important ones like squats, lunges, deadlifts, calf raises, and core work like planks and anti-rotation exercises. Because when your car is strong, your balance is strong too. And no, you won't bulk up, don't worry, in a way that slows you down. That is pure myth. Let's not completely dismiss footwear altogether. So when do your shoes matter? Well, shoes matter most when they're causing pain or injury, they're worn out generally 300 to 500 miles, or they don't match your running style or terrain. Also, at higher levels of competition, small gains matter. So the advanced shoes can improve efficiency very slightly. But for most runners, the performance gain from better shoes is pretty marginal compared to a consistent training, b strength development, and c good recovery habits. Let's not forget about the psychological trap. Because there's also a mindset going on when you're running. Because of course it's easier to blame shoes than to address your lack of strength training, inconsistent running habits, or poor recovery. And sometimes it's just that lack of knowledge of knowing what's what. So why do we blame our shoes? Well, of course, the biggest reason is it's easy, isn't it? It's easy. Oh, I must get new shoes and then I'll be fine. Buying new shoes feels productive. You feel like you're doing something, it's quick, it's exciting, and it's kind of fun. Who doesn't like shopping? Well, some people don't like shopping, but I love shopping. Doing strength training is not that glamorous, is it? And remembering to do your 10 or your 50 squats a day. It's you know, it can be boring to some people. Doing single-leg squats in your living room, definitely not Instagram worthy, but one of those actually changes your running. Doing mobility work at 7 a.m., not so much, but one changes your results and the other mostly changes your Instagram. What should you really be focusing on? If you are really serious about improving your running, here's your priority list. So I've put them in five, order of five. So the first one has to be consistency in your running. Second one, you need to build aerobic endurance. And the third one, strength training, definitely non-negotiable. Number four, mobility and recovery. And five, yes, then you can optimize your shoes. Think of the shoes as the final five percent, and not the foundation of everything. So here's my closing thought. What is really holding you back? In most cases, it's not your shoes, it's the strength, the coordination, and the resilience of your body. And the good news, that's something you can definitely change just by a little bit of training, a little bit of consistency, a few times a week, doing some consistent weights and exercises for the glutes, the thighs, the calf muscles. So you don't need the latest model, but you do need stronger legs, better mechanics, and consistent effort to make sure those muscles can do what you want it to do. So if you'd like to join a community of runners sharing stories and tips, head over to our Facebook page. I'll drop the link in the show notes. And if you would like an online consultation or have any questions about force health, diabetic running or anything and everything in between, please do visit our website. There's lots and lots of information on there. The links are in the show notes as well. So your feet are stronger than you think. And let's keep them down like that.