1 - Set up a sturdy box or bench at an appropriate height (typically knee height or slightly below).
2 - Position a barbell across your upper back, resting it on your traps as you would for a back squat. Grip the bar slightly wider than shoulder-width for stability.
3 - Stand facing the box with your feet hip-width apart.
4 - Place your right foot firmly and flat on top of the box, ensuring your entire foot is on the surface.
5 - Drive through your right heel to step up, bringing your left foot up to meet your right foot on top of the box. Keep your torso upright and core braced throughout.
6 - Carefully lower your left foot back down to the floor in a controlled manner, followed by your right foot to return to the starting position.
7 - Alternate legs for each repetition or complete all reps on one side before switching.