Back Stretcher Massager I am selling this because I discovered a spinal abnormality before using it, and my doctor advised against its use (crying). It's sturdy enough to handle my weight (over 100kg). And it's easy to use, just fit it into the grooves, so you can enjoy it at your preferred angle. ■ Product Description ・Lumbar Relaxation ・Stretcher Massager ・Adjustable Support ・Waist Stretching Aid ・Assembly Required Shipping included. Thank you!