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Place a pair of dumbbells on the floor around shoulder-width apart, handles running parallel with each other. Assume a push-up position in which you’re grasping the handles and your shoulders are directly above your hands with your body in a rigid plank. Shift your weight slightly to one arm, then pull the dumbbell in your opposite hand up to the bottom of your rib cage in a rowing motion. Keep your shoulders square to the floor throughout. Lower the dumbbell back to the floor, then repeat on the other side. Alternate arms every other rep.