The Lifefit Exercise Wheel Single The LIFEFIT EXERCISE SINGLE WHEEL offers very effective strengthening of the abdominal muscles as well as the arms, chest and back muscles. The handles of the LIFEFIT balance wheel are non-slip for a comfortable grip. - exercise wheel LIFEFIT EXERCISE SINGLE WHEEL - strengthens and shapes the waist - strengthens arms, shoulders and back - material: plastic - wheel material: plastic + rubber