The single-leg box squat is a bodyweight exercise that targets the muscles of the lower body, including the quads, glutes, and hamstrings. It is similar in form to a pistol squat, except that you sit to a box. This allows you to customize the depth of the movement to your movement abilities and mobility level. For this reason, the single-leg box squat is a popular movement for building leg strength in beginning trainees. It can be performed in lower strength-focused rep ranges, such as 5-8 reps per leg, or for higher reps for muscle building.