Quadriceps, Hamstring, Calves, Glutes
Stand facing away from box, platform or adjustable height bench position just behind your legs. Extend arms in front of you and balance on one leg with opposite leg extended forward off the ground.
With a slow and controlled movement start squatting down while keeping the elevated leg off of flor. Keep back straight and supporting knee pointed same direction as foot supporting.
Once your buttock makes contact with the box, raise your body back up to original position until knee and hip of supporting leg is straight.
Repeat for the required amount of repetitions and switch legs.
Progressions And Regressions