Sled Push · Shin Angle at Contact

Why this matters

Pushing a sled is the same problem as the acceleration phase of a sprint: you have to direct the ground reaction force horizontally backward to move a heavy mass forward. The shin angle is what aims that force.

A steep forward shin sends the push back into the floor behind you. A vertical shin sends it straight down — and the foot slips.

On the high-friction Hyrox track, a forward shin (knee well ahead of the toes) is what keeps the foot planted and converts leg drive into sled movement.

What good looks like

• Knee clearly ahead of the toes at the plant.
• Shin raked forward 45–55° off vertical.
• Foot locks into the surface rather than skidding.

Common faults

Too Vertical (< 40°)

The shin is too upright, so the ground reaction force points mostly straight down. There's little horizontal component to drive the sled, and the foot tends to slip.

Causes: short steps, fear of committing the body forward, or trying to "stand tall" under load.

Effect: lost traction, a stalled sled, wasted steps.

Over-Lean (> 60°)

Knee driven far past the toes. The athlete risks stumbling and the step gets chopped short.

Coaching cues

• "Knee over toe, drive back" — sets the forward shin and the backward force direction.
• "Push the ground behind you" — names the horizontal reaction.
• "Long, low steps" — loads the shin angle naturally.

How to draw

1. Pause on the exact frame the front (recovery) foot strikes the carpet to begin its drive.
2. First point: lateral malleolus (ankle).
3. Second point: lateral femoral condyle (knee) of the same front leg.
4. The acute angle vs vertical is the forward-lean reading.

Related measurements

• Trunk Angle at Contact — same frame; confirms the chest stays low as the foot plants.
• Knee Extension at Push-Off — the back leg finishing its stroke while this front leg plants.