Jogging while one leg performs a quick, full sprint cycle every few steps. It teaches the heel to come up under the seat and the foot to strike down fast.
Dose
3 × 20 m per leg
Rest
Walk back
How to do it
Jog forward with short, easy steps.
Every third step, snap one leg through a sprint cycle: heel up under the seat, knee forward, foot straight down to the ground.
Jog on and repeat with the same leg, then switch legs on the next run.