Full Upper Body Exercise Equipment: U Spring Bar is an upgraded version of the traditional power twister bar that stimulates more muscle groups. Including chest clip muscle workout, chest workout, wrist workout, arm workout, back workout, shoulder workout. It is a great arm trainer for men to build a perfect body shape Durable Construction: U-shaped twister arm trainer double steel spring powerful buffer rebound smooth, thickened steel tube to increase the training intensity, muscle shaping is guaranteed. Our arm trainer is durable and rust-resistant 3 Upgraded Protections: Chest workout equipment is easy to exercise with curved grips, thickened foam handle is comfortable to grip, non-slip and does not hurt your hands. Wear-resistant holster wraps the spring to avoid sports injuries, not clip hair and muscles Adjustable Resistance: Chest exerciser for men, enhanced resistance 40-110lbs.