Features: -The rollers are specially designed with five layers that work together to provide anti-slip, shock absorption, noise reduction, and support. -It deploys and retracts easily with automatic rebound and a smart auxiliary brake system, ensuring smooth and controlled movement. -Ergonomically designed with elbow support pads, it can exercise the back, shoulders, chest, abdomen, core muscle groups and torso lines. -It adopts a four-wheel design, and each wheel is widened/lengthened to expand the contact area with the ground and enhance stability during exercise. -It can improve your exercise habits and is easy to carry, suitable for home, office, travel, business trip, etc. .