1.[Full Upper body Workout] The Arm Twister works the chest, arms, shoulders, back and core with push and pull twists. Follow the illustrated guide for multi - angle training to help you get killer chest exercises to strengthen muscles and improve upper body curves. Perfect for family fitness or office breaks. 2.[Universal muscle training] Double spring design, can rotate action, can activate the wrist, arms, chest and legs at the same time. Effortless stretches, chest expansions and core exercises. Just follow the standard guidelines and you will have a stronger body. 3.[Comfortable and material] High strength metal spring, strong elasticity, durable and stable. Ergonomic foam contoured palm for non - slip grip. 3 adjustable resistance levels for different fitness levels. 4.[ and time - saving] Compact detachable design that can easily fit into a suitcase or backpack without taking up space. Train anywhere - at home, on the road, or outdoors. A daily 10 - minute workout that combines press and rotation to activate the whole body and replace the gym equipment is a great addition to your fitness