Every rep you have ever done started at the floor. The squat, the deadlift, the sprint, the tire flip, the step off a curb with a toddler on your hip — force gets created against the ground and travels up. Which makes it strange that foot and ankle strength is the one link in that chain almost nobody trains on purpose. People will spend an hour a week on biceps and zero minutes on the two structures that touch the ground roughly seven thousand times a day.
The bill comes due in ways that rarely get traced back to the source. Plantar fascia pain that flares on the first steps out of bed. A knee that aches on stairs. Hips that never quite feel loose no matter how much stretching gets thrown at them. A squat that tips forward no matter how many cues a coach gives. In a lot of those cases the knee, hip, and back are the symptom and the foot and ankle are the cause — a stiff ankle and a weak, sensory-dulled foot force the joints above them to absorb work they were never designed to do.
This is a practical brief on how the foot and ankle actually function, why modern life quietly weakens them, and the specific, unglamorous work that rebuilds them. None of it requires equipment. Most of it can be done barefoot on grass in ten minutes, which is exactly how we do it at Warrior Field before the sun goes down over Ewa Beach.
- ›Each foot has 26 bones and over 100 muscles, tendons, and ligaments — a quarter of your skeleton sits below your ankles, and almost none of it gets trained on purpose.
- ›Arch supports and thick cushioning do the intrinsic foot muscles' job for them, and a muscle that never works atrophies — which is the mechanism behind most plantar fascia pain.
- ›Test ankle dorsiflexion with the knee-to-wall test: under about four inches of clearance and your squat, knee, and hip are already compensating for it.
- ›Balance is a strength and sensory skill, not a party trick — if your single-leg hold collapses when you close your eyes, you've been balancing with your vision.
- ›The short-foot hold, slow full-range calf raises with straight and bent knees, tibialis raises, and single-leg loaded work rebuild the whole chain in about ten minutes a day.
The Foundation Everyone Trains Last
Each foot contains 26 bones, 33 joints, and more than 100 muscles, tendons, and ligaments. About a quarter of the bones in your entire body are below your ankles. That is not accidental architecture — it is a structure built to be both a shock absorber and a rigid lever, switching between those two jobs several times per second while you walk. When you land, the foot is supposed to unlock and spread to dissipate force. When you push off, it is supposed to stiffen into a springboard. A foot that can't do both is a foot that hands the job to something upstream.
The muscles that manage that transition come in two groups. The extrinsic muscles start in the shin and calf and cross the ankle to attach in the foot — these are the big movers most people already know. The intrinsic muscles live entirely inside the foot, and they are the ones that control the arch, stabilize the toes, and feed the nervous system information about where you are in space. Research using ultrasound and MRI has shown these intrinsic muscles behave much like the deep core muscles of the trunk: they fire in anticipation of load, and when they're weak, the structure they support gets sloppy under stress.
Here is the part that matters for anyone reading this on Oahu. Weak intrinsic foot muscles don't announce themselves. Nothing hurts, at first. The arch just quietly collapses a few more millimeters under load, the ankle rolls in a little further on every step, and the knee tracks inward to compensate — a chain of small compensations repeated thousands of times per day. That accumulated compensation is where a huge share of overuse pain in the knee, shin, and hip actually originates.
So when we talk about foot and ankle strength, we're not talking about a rehab afterthought or a physical-therapy consolation prize. We're talking about the base of the kinetic chain. Building strength above a broken foundation is how people end up strong and constantly injured at the same time.
What Cushioned Shoes Actually Cost You
Modern shoes do three things to the foot, and all three weaken it. First, an elevated heel shortens the calf and Achilles over time, reducing how far the shin can travel over the foot. Second, an arch support does the job the intrinsic muscles are supposed to do — and a muscle that never has to work atrophies, exactly like an arm in a cast. Third, thick cushioning muffles the sensory information coming off the sole, which is the input your balance system depends on most when you're moving fast or on uneven ground.
That third one is underrated. The bottom of the foot is dense with mechanoreceptors — pressure and stretch sensors that tell your nervous system where your center of mass is relative to your base of support. Dull that signal and the body compensates with vision and inner-ear input, which are slower and less precise. This is a big reason people who feel steady on a flat gym floor feel wobbly the second they're on grass, sand, or a trail. It isn't a fitness problem. It's a sensory problem.
The plantar fascia gets caught in the middle of all this. It's a thick band of connective tissue running from the heel to the base of the toes, and it works as part of a spring system with the intrinsic muscles and the Achilles. When the muscles that share that load are weak, the fascia takes a larger share of every step. That's the mechanism behind most plantar fasciitis: not a mysterious inflammation, but a tissue chronically overloaded because its support crew stopped showing up. It's the same mechanism that makes tissue tolerance a load problem rather than a stretching problem — the same logic that separates real mobility from passive stretching.
None of this means shoes are the enemy. It means the foot needs dedicated stimulus that shoes remove. You wouldn't wear a back brace for sixteen hours a day and expect a strong spine. Same principle, different end of the body.
Ankle Dorsiflexion: The Restriction Hiding in Your Squat
Dorsiflexion is the ankle's ability to let the shin travel forward over the foot. It is the single most commonly restricted joint action in adults, and it quietly rewrites how you move. Test it yourself with the knee-to-wall test: kneel with one foot flat, toes a measured distance from a wall, and drive the knee straight forward until it touches without the heel lifting. Most people should be able to clear about four to five inches. Plenty of adults measure two.
When dorsiflexion is limited, the body finds the range somewhere else. The heel lifts early in a squat and dumps you forward. The foot flattens and rotates outward to fake the range through the arch — which loads the knee inward. The hip flexes further to keep you balanced, which rounds the low back at the bottom of a lift. Every one of those is a coaching cue people chase for months without addressing the ankle that caused it.
The fix is rarely just stretching the calf, because the restriction is often a mix of tissue stiffness in the calf and Achilles, joint capsule tightness at the front of the ankle, and a nervous system that guards a range it doesn't feel strong in. That last part is why loaded work beats passive stretching: a slow, deep calf raise off a step, a heel-elevated split squat, or a controlled knee-to-wall drive with a band pulling the ankle bone backward all build range you can actually access under load.
Two to three minutes per side, most days, moves this measurably in a few weeks. Not glamorous. But an ankle that gains two inches of dorsiflexion changes the mechanics of every squat, lunge, step-up, and landing you do for the rest of your life, and it takes pressure off the knee immediately.
Balance Is a Foot Skill, Not a Party Trick
Ask most people to stand on one leg and they'll treat it as a novelty. It isn't. Single-leg stance is the position you spend most of your walking life in — during normal gait, you are on one foot roughly 40 percent of each stride cycle, and every one of those moments is managed by the foot, ankle, and hip acting together. Balance isn't a separate quality bolted onto fitness. It's the visible output of foot strength plus sensory input plus hip control.
There's a useful field test here: stand on one leg, arms at your sides, eyes open, on a firm surface. Under 60 and struggling to hold 30 seconds is a flag. Then close your eyes. Most people lose 60 to 80 percent of their hold time the second vision is removed, because they've been balancing with their eyes instead of their feet. That gap is the size of the sensory deficit you're carrying around.
This gets more consequential with age, and it's worth being blunt about why. Falls are the leading cause of injury-related death in older adults, and the ability to catch yourself in that first half-second depends on the foot detecting the shift and the ankle and hip producing force fast enough to answer it. Strength matters more than balance drills in that equation — a point we've made before in our breakdown of why fall prevention is really a strength and power problem — but the foot is the sensor that starts the whole reaction.
The good news is that this trains fast. Proprioceptive work produces measurable improvement in weeks, not months, because you're largely retraining a nervous system that already knows how — it just stopped getting the signal.
The Protocol: Building Feet That Hold Up
Start with the short-foot exercise. Sit or stand barefoot, foot flat, and without curling your toes, draw the ball of the foot slightly toward the heel so the arch lifts a few millimeters. Hold five seconds, release, repeat ten times per side. It looks like nothing is happening. It's the most direct way to wake up the intrinsic muscles, and it's the single most researched foot-strengthening drill there is. Two sets a day for a few weeks changes how the arch behaves under load.
Then add loaded calf work through full range. Slow calf raises off a step — three seconds up, a pause at the top, four seconds down — done both with a straight knee and with a bent knee, because the bent-knee version shifts the work onto the soleus, the deeper calf muscle that handles most of the load during walking and running. Two to three sets of 10 to 15, two or three times a week. Add load once bodyweight sets get easy. This is real strength training, not a warm-up.
Balance the front of the shin too. Tibialis raises — heels on the ground, back against a wall, pulling the toes up toward the shin against gravity or a band — build the muscle that decelerates your foot on every heel strike. It's the most neglected muscle in the lower leg and one of the most protective against shin splints. Then progress toward single-leg loaded work: single-leg Romanian deadlifts, step-downs, and split squats force the foot to stabilize while the rest of the chain produces force, which is how it works in life anyway.
Progress the surface, not just the load. Barefoot standing work on a firm floor, then on grass, then eyes-closed on grass, then dynamic work — hops, cuts, landings — is a sane four-stage ladder. If you want structured programming to follow between sessions, the BTB Strong app has mobility and single-leg work you can run in ten minutes at home. And go slow with barefoot volume: tissue adapts on a longer timeline than enthusiasm does, and the fastest way to earn a foot injury is to do six weeks of barefoot work in one week.
Why We Train Barefoot on Grass at Warrior Field
Big Tire Bootcamp trains outdoors on the grass at Warrior Field, at the West Oahu Veterans Center in Ewa Beach, and that surface does something a rubber gym floor can't. Grass is subtly uneven. Every rep on it asks the foot and ankle for micro-corrections that a flat, predictable floor never requires. Take the shoes off for the warm-up and the balance work, and you've turned a mundane ten minutes into direct sensory and intrinsic-muscle training — for free, before the session even starts.
It also fits how we already train. Loaded carries, sled pushes, tire work, and step-ups are foot and ankle training whether anyone labels them that way or not, because they demand that the arch hold its shape while real load passes through it. Tuesday, Wednesday, and Thursday at 5:30 PM and Saturday at 6:00 AM, that's the work. What we add on top is the deliberate stuff — the short-foot holds, the slow calf raises, the single-leg balance with eyes closed — because those close the specific gaps that a lifetime in cushioned shoes creates. You can see the full weekly rundown on our class schedule.
This scales to every body, which matters at a gym where veterans, active duty, adaptive athletes, and complete beginners all train on the same field. Someone managing a below-knee prosthesis works the intact side's foot strength and the hip control on both. Someone with neuropathy trains balance with a hand on a support and progresses from there. Someone rebuilding after an ankle fracture starts with seated short-foot work and earns the standing version. The principle doesn't change — only the entry point does. Veterans and active duty train free, and they always will.
If you're on Oahu, come out to Warrior Field and claim your free 7-day pass. Take your shoes off for ten minutes of it, stand on one leg with your eyes closed, and find out what your feet have actually been doing for you all these years — then start paying that foundation back with real work. The field is uneven, the crew is welcoming, and every body is welcome on it. And wherever you are in the world, check out our app at btbstrong.com — free tools and resources to help you get better no matter where you're starting from.
Frequently Asked Questions
- How do I strengthen my feet and ankles at home?
- Start with the short-foot exercise: barefoot, lift the arch slightly without curling the toes, hold five seconds, ten reps per side, twice daily. Add slow calf raises off a step with both a straight and a bent knee, tibialis raises for the front of the shin, and 30-second single-leg holds progressing to eyes closed. That's roughly ten minutes, needs no equipment, and hits the intrinsic muscles, the calf complex, and balance together.
- What actually causes plantar fasciitis?
- Usually load, not inflammation. The plantar fascia shares the job of supporting your arch with the intrinsic foot muscles and the Achilles. When those muscles are weak or the ankle is stiff, the fascia absorbs a larger share of every step until the tissue's tolerance is exceeded. That's why stretching alone often fails and progressive loading — calf raises, short-foot work, and slow toe-extended heel raises — tends to work better over a few months.
- Is barefoot training actually good for you?
- In measured doses, yes. Training barefoot restores sensory input from the sole and forces the intrinsic foot muscles to work instead of leaning on an arch support. The risk is volume: those tissues adapt more slowly than your enthusiasm does. Start with warm-ups and balance work barefoot on grass, keep loaded and high-impact work in shoes at first, and add barefoot volume over weeks. If you have diabetes or neuropathy, check with your doctor before going barefoot outdoors.
- How much ankle dorsiflexion should I have?
- Use the knee-to-wall test — foot flat, drive the knee straight forward to the wall without the heel lifting. About four to five inches of clearance is a reasonable working standard, and many adults measure closer to two. Below that range, the body borrows motion elsewhere: heels lift in the squat, the arch flattens, and the knee drifts inward. Two to three minutes per side most days of loaded, end-range work moves this measurably within a few weeks.