1. Elevate the toes of the foot that starts on the floor. This will minimize the participation of the straightened leg.
2. Keep both feet aligned. The straightened leg (foot on the floor) is lower than the working leg (on the box) but they line up together. Neither foot is further forward as it would be with a regular step-up.
3. Do the eccentric slowly. You'll be able to do this because your body is over the base of support, not outside of it like it is in a regular step-up. – Christian Thibaudeau
