Lean into the straps and fire a knee like a sprint launch.
Hold a straight body line from head to heel and drive off the ball of your foot.
Leaning into the straps at forty five degrees recreates the drive angle of a sprint start, and every knee drive fires the quads and glutes at exactly that acceleration angle, one leg at a time until the set is done. The standing leg holds your bodyweight on the ball of the foot while the moving leg cycles from extended back to knee at chest, the exact shape of a first stride. It earns its place with anyone who runs, letting you rehearse and strengthen the acceleration position for reps without ever leaving the spot.
Acceleration mechanics and single-leg drive. The strap-supported lean holds you at a sprint-start angle so you can repeat powerful knee drives from the exact position sprinting starts from.
Acceleration happens leaning forward, not upright. The straps under your armpits let you hold that forty five degree line safely, so the knee drive is trained at the angle it gets used.
Fast and crisp, that is the point, but the body line comes first. Hold rigid from head to heel, drive off the ball of the standing foot, and add speed only while the line holds.
