SPRI Back reliever NEW LOOSEN STIFF BACK MUSCLES Relieve back pain, improve flexibility, and find proper alignment while also reducing soreness by strengthening the abs, oblique's and lower back. With an ergonomic design, this massager safely stretches and supports the spine and back muscles. Stretch and sooth tired sore muscles in the back with the ultimate Back Reliever. The firm texture will soothe deep tissue by stimulating muscles . Carefully read description, check out all photos.