In Phase 1: Stabilization Endurance Training, exercises should challenge balance, core stability, and muscular endurance. NASM categorizes the single-leg squat to row as an integrated stabilization exercise because it combines a balance challenge (single-leg stance) with an upper body pulling movement, requiring total-body coordination and postural control. By contrast, a seated dumbbell shoulder press or seated biceps curl eliminates stability demands by providing a fixed base, and a barbell squat is more of a strength-level movement. The stabilization phase often uses unstable environments (like balance pads, single-leg positions, or stability balls) to train the body's ability to control motion under load-exactly what the single-leg squat to row accomplishes.