Let's call it directly: if the board keeps bucking you off mid-glide, your legs are straight. You might not believe it — everyone's sure they're bending their knees — but film almost any rider who's getting tossed and there they are, gliding along like they're waiting for a bus.
The physics here are simple and completely unforgiving.
Your knees are the suspension — or nothing is
Water is never flat. Even a clean glide crosses ripples, texture, little seams of moving water, and every one of them kicks the board slightly. That energy travels upward and has to be absorbed somewhere.
Bent knees absorb it. They're shock absorbers in the most literal sense — the board jolts, the knees flex a touch deeper, the jolt dies in your thighs and your head never moves. Straight legs absorb nothing. They're rigid columns, so every kick transmits straight through to your torso — and because standing tall also raises your center of mass, each shove arrives with more leverage to topple you. Tall doesn't just skip the suspension; it makes every hit count double. That's the bucking: not big water, just small texture delivered at full volume.
Why do legs straighten when nobody tells them to? Two reasons. Fatigue — a proper crouch is quietly hard work, and tired quads vote to stand up. And instinct — when something feels unstable, the body's reflex is to rise and look around, which is exactly backward on a board. Both mean the crouch can't just be understood; it has to be conditioned until it's the default that survives fatigue and surprise.
Depth-wise, think athletic, not extreme: knees clearly bent, hips back a little, chest up, weight centered over the board — the position you'd guard someone from in basketball. When we analyze glide clips, knee bend through the glide is the number that separates smooth riders from rattled ones; CoachVision reads it from an ordinary side-on phone clip, and the pattern across riders is consistent — the crouch measured is almost always shallower than the crouch remembered.
The drill — Static Stance Holds
Condition the position with Static Stance Holds. Put your board on sand (or stand on a balance board) and hold your glide crouch for 30 seconds — low, quiet, centered, exactly the depth you want on the water. Then close your eyes and hold 15 more.
The eyes-closed portion is where the real training lives. With vision gone, your balance has to run on feel — pressure through the feet, position sense in the ankles and knees — which is precisely the system that keeps a crouch alive when your eyes are busy watching a wave. Do 5 rounds. By round four your thighs will be reporting in; that burn is the fatigue-resistance being built, the thing that keeps your knees bent in minute forty of a session when they'd rather straighten.
Then on the water, one cue only: when the board starts talking, get lower. Every jolt is an instruction to sink, never to rise.
You're one habit away from the smooth version of your own riding. The knees already know how to bend — this is just teaching them to stay there.