【Fully Fabric-Covered, Silent Design】 High-density fabric completely blocks the sound of the springs. Allows for training even late at night in apartments. 【Lumbar Protection, Flexible Frame】 Supple material absorbs impact to the lower back. Prevents injury to internal organs even during long rotations. 【High-Load, Reinforced Springs】 Thick internal springs provide 1.5 times the normal load. Burn more calories in the same amount of time. 【Multi-Functional Convertible System】 Provides a variety of training options, from yoga warm-ups to fat burning, all in one machine. 【Foldable and Storable】 Can be rolled up and stored in the gaps of a bag. Perfect for training in your spare time while traveling or at the office.