Power ring: Get an isometric muscles power ring exerciser. Features: Strengthens muscles and burns fat rapidly based on the rotation rate of the internal steel ball with resistance adjustment for a more intense exercise experience. Isometric: 100% isometric exercise equipment that is suitable for injury rehabilitation, you will see results with as little as nine minutes of spinning a day. Sizes: 29.3cm x 28.7cm x 6.1cm. Material: PC and steel ball. Full body workout: Simply rotate the power ring for upper body work outs, chest, shoulder, forearms, biceps and arms. Isometric Power Ring Exerciser | Living Social | Living Social