This Roller Crunch Coaster Fitness Machine provides a workout solution for strengthening your midsection of your body. It designs bottom up workout function that is oppositefrom other abs crunch machine. In this way, it also works shoulders, back, arms and legs.It integrates contoured padded cushion for supporting arms and legs during workout.This machine can be used as a part of complete fitness routine or as an abdominal trainer.This portable easy-to-use exercise machine. Coaster helps keep your abdominal region in superb shape, while the adjustable seat allows for convenient exercises to get rid of love handles.Abdominal trainer promotes core stabilization while exercising the abdominal through a full range of motion.coaster features a multi-angle adjustable seat and plate-loading posts to add extra weights Durable, long-lasting steel construction supports up to 300 lbs.Perfect for beginners and long-time fitness enthusiasts alike Curved track mimics natural spinal flexion, allowing anyone to perform an abdominal lift in perfect form. Details Show: 40° Ergonomic Design The 40° ergonomic design conforms to the curvature of the human spine and effectively reduces lumbar spine injuries. Mute Roller Mute roller, mechanical grinding, smooth abdomen, low noise. High Rebound Material Space cotton high rebound material, effectively reduce knee pressure caused by pain. 250kg Bearing Capacity 250kg Bearing Capacity, high quality steel triangle stable structure Thick Steel Thick steel, good load bearing, curved track is more fun. Foldable Design Fold easily and take up no space. Easily switch in three seconds.