WHY The towel provides resistance to strengthen the upper back. HOW Partner A, stand with feet shoulder-width apart, knees slightly bent, abs engaged. Grasp the doubled-over towel in both hands and extend your arms. Partner B, hold a split stance, abs engaged. Grasp the towel in both hands and create some resistance. Partner A, keep your shoulders down as you row your elbows back and squeeze your shoulderblades together. Return to the starting position. This is 1 rep.