Features: 1. Abdominal exercise, backward stretching, elbows, pushups, etc.2. Compact design, S-shaped curve, easy to carry and easy to use.Ideal for family strength training.3. Update the rubber suction cup at the bottom of the seat post, which has strong suction and is more secure and stable.4. Reduce stress and improve joint flexibility and mobility.Installation and removal procedure: 1. Find a clean and flat floor and avoid empty spaces between floors.2. Place the crunch bar on the ground and pull the block down.3. Adjust the position of the gear to a comfortable height to fit your feet.4. After exercise, lift the lock to unlock the device. Packing list: 1 * double bar auxiliary Material: manganese steel, thin cotton, silicone Find answers in product info, Q&As, reviews