Step up sideways, drive the knee, balance it out.
Push through the box foot, don't push off the floor foot to cheat the step up.
This takes the side-on step up and stacks a balance problem on top, once the quad and glute of the working leg have lifted you onto the box, you drive the free knee to your chest and hold the top position on one foot. That end-range knee drive turns a strength move into a single-leg stability drill, the standing glute has to lock the pelvis level while everything else moves. It suits athletes who want their leg strength to show up mid-stride, not just under a bar.
A balance and hip-control demand at the top. Instead of tapping the box and stepping down, you have to stabilise on one leg while driving the other knee up, which mimics sprinting and climbing mechanics far more closely.
Usually you're rushing the step up and arriving at the top off balance. Press through the whole foot on the box, finish the hip fully, then drive the knee. Slower reps fix the wobble faster than more reps do.
Yes, it's excellent before lower-body sessions or running. A couple of controlled sets per side wakes up the quads, glutes and balance systems without draining anything.
