Drive one knee like you're sprinting in place. Explosive and rhythmic.
Stay light and snappy. Drive the knee up hard rather than just lifting it slow.
Cycling one leg through a fast sprint action loads the hamstrings the way sprinting does, snapping the foot back down and under your hips on every rep while the glutes drive the leg through. Done explosively on the spot, it grooves the pawing-back mechanics that make you faster, one leg at a time so each side learns the rhythm. It earns its place as speed and power training that needs zero kit and pairs perfectly with sprint or athletic sessions.
Sprint mechanics and hamstring power. The fast cycle teaches your leg to strike down and pull back under your hips, which is the action that produces speed on the ground.
Fast, once the pattern is clean. The value is in the explosive knee drive and snappy turnover. Slow, deliberate reps are only for learning the movement in the first session or two.
Driving the knee up hard is half the movement, so that is normal early on. Focus equally on the aggressive downstroke, striking the foot back beneath you, and the hamstrings get their share.
