Exercise Advice: Wrap the exercise band to a door knob or other stationary object. Make sure that each side of the band has the same length. Step back several feet away from the door in order to take up the slack on the bands. With your feet about shoulder width apart, grab the handles and bend your knees slightly while keeping your back straight. Curl the handles in toward you in a smooth motion and make sure to flex your biceps at the end of the movement.