Hold a dumbbell in your left hand, bend your hips and knees, and lower your torso until it's almost parallel to the floor. Let the dumbbell hang at arm's length from your shoulder, palm facing in. In one motion, pull the dumbbell toward your body while rotating your torso to the left, keeping your elbow tucked close to your side. Pause, then lower the weight back to start. That's one rep. Complete all reps, then repeat on the other side. Use a bench or chair for stability.