Designed to tone arms and upper body ideal for muscle strengthening used during an aerobic workout will help increase intensity and calorie burn. can be used in a variety of upper and lower body and core exercises for overall strengthening and fitness purposes that will improve your health , strength and fitness reebok dumbbells have a hard wearing rubber surface for an extended lifespan, and are suitable for use in any circuit, studio or personal training session. the smooth high quality vinyl finish gives great grip while the iron inside strikes a serious tone3kg