Core Concepts

09/28/2026

Stand on one leg. Close your eyes. Count.

Most people get a few seconds and are genuinely shocked. Nothing about your strength changed in that second. Your information did.

Balance runs on three feeds: your eyes, your inner ear, and your body's own position sense. When one goes quiet the other two cover for it silently, for years, and you don't notice until something exposes it.

I wrote up how to find out which one of yours is quiet. Three tests, a wall and a cushion.

https://coreconcepts.substack.com/p/balance-isnt-strength-its-information?r=21i61h&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true

09/24/2026

Your knee goes where your shin takes it, and your shin only travels as far as your ankle lets it. When the ankle isn’t mobile enough, either you lose the range — shallow squat, short steps, early heel lift, stiff going down stairs — or you find it somewhere else: knee caving in, foot turning out, arch dumping.

THE TEST — knee-to-wall. Face a wall, one foot forward like a lunge, hands on the wall. Front foot flat, pointing straight, back knee bending (that leg is just balance). Drive the front knee past your toes until the heel starts to lift.

For a number: tape measure on the floor from the wall, big toe at 10cm, knee to the wall, heel down. If it touches, step back a centimetre and repeat. Your score is the furthest mark you can still reach from. Both legs.
Typical: about 10–11cm (1cm ≈ 3.6°, so 38–40°), and normal is wide.

Averages fall with age mostly because people stop using the range — train it and it stays. Your two sides should match: 2cm or more apart is worth attention, less is measurement error.

Four rules, or the number means nothing: foot flat · foot straight · arch doesn’t dump · knee over your 2nd toe.

Why it matters: walking needs roughly 10° just to let your shin pass over your foot, and every extra ~6.5° is worth about 10% more squat depth. Landing, your ankle absorbs a big share of the force; when it can’t, something above it does. Stiff ankles also keep company with Achilles and patellar tendon pain, plantar heel pain and ankle sprains (a link, not a cause).

THE FIX, and it isn’t a calf stretch: 
0️⃣ Texture first — 30 sec under each sole. Better signal, less guarding.
1️⃣ Rock into it — test position, knee to end range and back, 10–15 slow reps.
2️⃣ Pause deeper — 2–3 seconds at the end, heel down.
3️⃣ Front foot on a step — whole foot on it, so the knee travels further.
4️⃣ Supported deep squat — hold a door frame, heels down, 20–30 sec.

⚠️ Sharp pinch at the front of the ankle? Stop — that’s its own problem, worth getting checked. Generally needs joint mobilization.

👇 Two numbers — which side was stiffer?

09/21/2026

Wobbly on one leg? Knees cave when you squat? Your feet are offline.

Try this. Learn it sitting, then test it standing: lift just your big toe, other four stay down. Now the reverse. How you fail matters:
🔸 Toes barely move → stiff. That’s mobility, not control.
🔸 All five fly up → your long toe muscles are doing everything. Common with high arches. Looks like control, isn’t.
🔸 Big toe up, others down, and the reverse → you’ve got it.

Easy sitting, harder standing? Common with flat feet. And watch your heel: it should tilt slightly out as the toe lifts. Film it from behind (see pinned comment).

Your feet have two jobs, every step. Read the ground. Standing, your feet are your brain’s biggest single source of balance info. Offline, it guesses: wobbling, reaching for the wall, unsure on stairs. Be your base.

Your foot spreads to absorb you as you land, then the small muscles inside it stiffen it so you can push off. That’s the floor under every squat, lunge, deadlift and sprint. When it can’t hold its shape, the knee often caves.

Chasing a heavier squat or trying to stop grabbing the railing? Same place to start.

The usual reason: shoes and flat floors all day. Nothing to feel. Flat or high arch, neither shape is the problem. Being stuck in one is. Your feet aren’t weak. They’re offline. And offline can be switched back on.

THE FIX, in order:
1️⃣ WAKE IT UP: texture first. Spiky mat, ball, grass. 30 seconds minimum, longer is better.
2️⃣ SWITCH IT ON: the test is the drill, sitting first. Hold the other toes down by hand if needed. Then the dome: draw the ball of your foot toward your heel, toes long, no curling.
3️⃣ LOAD IT: hold that shape standing, then on one leg, then set it before your squat or lunge. Toe splits too, once they’re easy sitting. Light effort, toes relaxed. A working foot, not a clenched one.

Two minutes at a time, a few times a day, never to fatigue.
⚠️ Diabetes or numbness in your feet? Skip the spiky stuff and check with your podiatrist first.
👇 Which foot was worse, left or right?

09/19/2026

New piece is live.

Some of you did the neck-turn test with me a while back. Turn your head, mark the spot, eyes side to side, turn again, go past your mark.

That video showed you it happens. It didn't have room for why, or for what to do about it.

So this one covers it. Why the stiff neck, the headaches and that vague "off" feeling are usually one system rather than three separate problems. What a recent review found about screen work, which is that when your focusing and your eye teaming stop matching, your upper trapezius switches on. The muscle you've been paying someone to dig into.

And three of my own clients, including one who kept telling me his neck hurt after months of long drives and never did get his eyes checked.

If you did that test back then, did you pass your mark?

If you've rehabbed the same neck, chased the same headache, or felt "off" and dizzy for no reason you can name, you might be blaming the messenger.

09/16/2026

Your balance is not a muscle problem. It is an information problem.

One system keeps you upright, and it runs on three feeds. Your brain does not treat them equally. It weights them by how reliable each one is right now.

Vision. Retinal slip and optic flow. In quiet standing it does roughly 10% of the work.

Vestibular. Your inner ear reads two different things: angular acceleration in the semicircular canals every time you turn your head, and linear acceleration in the otoliths. About 20%.

Somatosensory. Muscle spindles, joint receptors, and the skin on the soles of your feet. About 70%. Foot afferents alone carry enough information to hold you upright, which is worth a thought next time you spend a day in shoes on flat floors.

Here is an interesting thing. That weighting is dynamic. Degrade one feed and your brain does not repair it, it reweights. Take vision away and it shifts onto inner ear and feet. Put you on something soft and it leans back on vision.

That is a good system, and it is also why a feed can go quiet for years without you noticing. The compensation is silent. What you notice is the cost of compensating.

And your neck is not a passive joint in this. It is packed with position sensors, and the longus colli, the deep muscle running up the front of your cervical spine, carries an unusual number of them compared with the muscles at the back. There is a good case that the single most important job of your cervical spine is aiming your eyes. Which is why a stiff neck, a headache and an off day for your balance are not three separate events.

Three tests in the free guide tell you which feed has gone quiet. Then four fixes, one per job.
Comment RELIEF and I’ll send you the link. 👇

Educational, not medical advice.

09/13/2026

My first attempt at this was 5 seconds. My third, a minute later, was 46 seconds.

Nothing got stronger in that minute. My brain just went looking for information somewhere other than my eyes.

In normal standing your balance runs about 70% on vision, 20% inner ear, 10% the position sense in your feet. Shut your eyes and most of it vanishes — and it takes a few goes for your nervous system to shift onto the other two. So your first attempt isn’t your balance. It’s your brain getting caught out.

THE TEST (near a wall): stand on one leg, other knee up, foot behind, hands at your sides. Settle with your eyes open, then close them and start the clock. Time it until you lose it. Best of three or four — then the other leg.

THE STANDARD, eyes closed:
⏱️ 20–49 → 25–29 sec
⏱️ 50–59 → 21 sec
⏱️ 60–69 → ~10 sec
⏱️ 70+ → 4 sec

Nowhere near it? You’re vision-dependent, not broken.

So train the other two:

1️⃣ INNER EAR. Two feet. Thumb up at arm’s length, eyes locked on the nail. Keep the thumb still and turn your head — side to side, then up and down. Go as fast as you can while the nail stays sharp. Too slow and your inner ear doesn’t register it at all. 30 seconds each way.

2️⃣ FEET. Wake them first — 30 seconds on a spiky ball, or just rub the soles. Then short foot: sitting down, draw the ball of your foot toward your heel to lift the arch. Toes long, no curling. Learn it seated, then stand in it, then balance on one leg, then on a cushion.
Both eyes open. Eyes closed is only ever the test.
Two minutes at a time, a few times a day, never to fatigue. Retest in a few weeks — anything that improves in ten minutes is calibration, not adaptation.
(New, severe or spinning dizziness, or dizziness with headache, vision or speech changes, is a see-a-professional situation, not a self-test.)

👇 Three numbers: first attempt, best attempt, age band. Mine was 5 → 46. And which leg was worse?

09/09/2026

Last post, you found your weak eye, cover the strong one and your balance falls apart. Today: how to actually close that gap.

The rule for fixing any weak link in the body is the same, and the order matters: isolate, then integrate. You can’t strengthen something while it’s buried in the middle of everything else — you pull it out, train it on its own, then fold it back in. Here’s what that looks like for your eyes 👇

Step 1 — ISOLATE (~30 seconds).Cover your strong eye with your palm so the weak one has no choice but to work. Give it a little focused input:
🔸 Smooth pursuits — track your thumb slowly: side to side, up and down, and the diagonals
🔸 Saccades — snap your eyes between two fixed points (a doorknob and a light switch)
🔸 Near-to-far — focus on your thumb up close, then something across the room, and back. Keep it gentle. If the eye’s genuinely weak it’ll tire fast — that’s information, not failure.

Step 2 — INTEGRATE: Uncover, stand on one leg, balance again with both eyes open. This is the part people skip: you’re handing the movement back to your brain now that the weak eye is feeding cleaner information, so your whole system relearns to trust that side.

Then re-test. Cover each eye again the way you found the gap. Smaller difference? That’s it working — for you, not just in theory. That re-test isn’t a formality, it’s the whole method.

A word on dose, because this is where most people go wrong: short and often beats long and brutal. A weak visual system fatigues fast, and grinding it to exhaustion backfires — your brain reads the overload as a threat and clamps down (that’s often where the post-session headache comes from). Thirty seconds twice a day will out-train one punishing session every time. Near a wall, and always finish on a good rep.

And remember from the last one: a side your brain trusts is a side it’ll actually load — so this isn’t just steadier balance, it’s the control (and the strength that rides on it) coming back to that side.

👇 Did the gap shrink after your re-test? Tell me which eye you’ve been carrying — I read every one.

09/08/2026

Ever notice one side of your body just feels off — a little less steady, a little less solid under load — and no amount of single-leg work seems to fix it? It might not be a muscle at all. It might be your eye.

Try the test in the video: stand on one leg, get steady, then cover one eye with your palm. Note it. Now switch and cover the other eye instead. For most people, one is clearly harder than the other.

Here’s why. Your balance runs on three inputs — your legs, your inner ear, and your eyes — and vision is a bigger share than almost anyone realizes. But your two eyes aren’t equal partners: one tends to “drive,” the way you have a dominant hand. When the weaker eye feeds a blurry or mismatched picture, your brain has to reconcile a reliable eye with an unreliable one — and it reads that conflict as uncertainty. So it hedges: more wobble on that side, and it quietly leans on the stronger eye to cover the gap. Cover the strong one, and the wobble it’s been hiding shows up.

And it’s not just balance. Your brain won’t put full force through a side it can’t confidently sense — stability is permission to produce strength. So the side with the muddier input often tests weaker under load, too. It’s not always a smaller muscle; sometimes it’s the eye feeding that side, making your brain cap the output as a protective hedge. Clean up the input, and the strength you already have can finally show up.

Want to train it? Do your single-leg work with your strong eye covered, so the weaker side has to carry the load and catch up. Near a wall, a few times a week. (Next post: the full drill.)

(One honest note: this is a fun awareness test, not a diagnosis — if one eye is dramatically worse, or your balance is genuinely off day to day, that’s worth getting your eyes and inner ear properly checked.)

👇 Which eye was your steady one — and did the other really throw you off? Tell me.

09/02/2026

Wired but exhausted. Jaw tight. Lying there at night with a body that won’t power down.

If that’s you, it’s not a willpower problem and it’s not your personality: it’s a nervous system stuck in the “on” position.

Here’s the thing that hardly anyone trains: we’re brilliant at switching stress ON: deadlines, scrolling, caffeine, the mental to-do list, and terrible at switching it OFF. Your body was built to fire up for a threat and then stand down. Modern life just never gives the “all clear,” so you simmer.

The good news: you have a physical off-switch, your vagus nerve, the main wire of your “rest-and-digest” system, and you can flip it on purpose.

One of the quickest ways in is through your eyes:
🔸 Sit tall with your hands resting in your lap (or lie down and cradle the back of your head — the support only matters lying down).
🔸 Keep your head still and slowly look as far to the right as is comfortable.
🔸 Hold your gaze there and wait: about 30 seconds, maybe more.
🔸 When you spontaneously sigh, swallow, or yawn, that’s the switch flipping. Come back to centre, then repeat looking left.

(This one’s from Stanley Rosenberg’s vagus-nerve work.) A few other doors to the same switch: a long, slow exhale that’s longer than your inhale · humming or gargling · cold water on your face · or the “Hook-ups” pose. All of them raise your vagal tone — which is just a fancy way of saying they help you feel calm and safe.
Do it before bed, or any time you catch yourself wound up. Two minutes.(sometimes longer)

👇 Did you sigh or yawn holding your gaze to the side? Tell me — that reflex is the whole point.

09/01/2026

Last time you tested your balance on two feet, heel-to-toe. If that got easy, it’s time to drop to one leg — and climb.

Here’s a 5-level ladder to actually train it. The rule: if a level is easy, it’s not changing anything. Strip one sensor at a time, then take it moving. Stay near a wall, and only climb when the level below feels steady.

Levels 1–3 — stay on one leg, strip one sensor at a time:
1️⃣ Eyes locked, head turns (the inner-ear trainer). On one leg, lock your eyes on a fixed spot and slowly turn your head side to side, then up and down. Keeping your eyes still while your head moves is exactly what your vestibular system (inner ear) is for — the piece most people never train, and the big one for dizziness.

2️⃣ Stand on a cushion. One leg on a pillow, folded towel, or couch cushion. The ground stops giving clean information, so your feet and ankles — packed with position sensors — have to wake up and work.

3️⃣ Close your eyes. One leg, eyes shut. You’ve just deleted vision — the sense you lean on hardest — so your ears and feet have to carry it alone. This one’s brutal; that’s why it’s last, not first.

Levels 4–5 — take it moving:
4️⃣ Walk heel-to-toe. A straight line, like a sobriety test. Moving balance is a separate, harder skill than holding still.

5️⃣ Walk heel-to-toe + turn your head. Same walk, now turning your head as you go — dynamic balance with your inner ear loaded. This is the one that carries over to real life and fall prevention.

60 seconds a day. A little wobble is the point — that’s the system getting the work it’s been missing.
(Same caveat as always: new, severe, or spinning dizziness — or dizziness with headache, vision, or speech changes — is a see-a-professional situation, not a self-test.)

👇 How far up the ladder did you get before you lost it — 1, 2, 3, 4, or 5?