Our Gaiam Performance No Knots Back Massager will get you moving and performing at your best. The high-density construction and 'back friendly' concave design will help you to release back tension and tightness as well as mobilising your spine. After all, a healthier back means a healthier you! Features & Benefits: Applies targeted massage to the muscles aligning the spine High density design works out knots and tightness Ridged profile promotes blood circulation for a quicker recovery Online guide gives you specific exercises for better results