One step, explode up, stick the landing clean.
Land quiet and absorbed, knees tracking over toes. Always step down, never jump down.
Adding a single approach step to the box jump teaches you to convert horizontal momentum into vertical explosion, exactly the transition that shows up in sport. The quads do the heavy lifting, loading fast on the step-in and firing you upward, with the glutes powering hip extension at takeoff. It earns its place as athletic power training, a bridge between a standing jump and true running jumps, and the soft landing on top keeps impact low.
One you can land on softly with a stable, quarter-squat position, for most people that is knee to mid-thigh height. Chasing max height turns the landing into a desperate tuck, which trains nothing but bruised shins.
Jumping down doubles the reps of landing impact for zero explosive benefit and is where most box jump injuries actually happen. Step down, reset your approach, and spend your energy on the jump up.
The step-in loads your legs with moving momentum, so you learn to gather and redirect force fast, the same skill as a layup or high jump approach. It usually adds height to your jump too, which makes it a fun progression.
