Peanut Massage BallThe Peanut Shape Ball is perfectly suited to giving youre spine a good loosen up as it has a nice groove down the middle for your vertebrae to rest in while bulging out to give the muscle down either side of your spine a nice firm massage. You can move it up and down your spine slowly, meaning at each level it; Loosens up the muscles and other soft tissues and Mobilizes your spine at the same time If you have any neck, shoulder, or upper back pain or