Bongers provide an invigorating percussion-like massage called tapotement which improves circulation, eases muscle tension, and even reduces the appearance of cellulite. Bongers are kind of like meat tenderizers. Use one, or two simultaneously. By tapping contracted and knotty muscles you can release tightness and relieve pain. Take Bongers anywhere for quick relief of back pain, headaches and tired, sore muscles. Fun and easy to use on yourself and your friends.