Loop band around a sturdy pole or banister at waist height. Hold both ends in right hand so band is taut and arm is extended, left hand on hip. Sit back slightly. Squeeze shoulder blades, bend elbow, and pull hand back toward ribs. Keep elbow close to body. Do 10 reps, then hold by ribs and pulse for 10 reps, releasing and pulling the band only a few inches each time. Repeat with left arm.