Improve your performance with the Pro-Tec Slider Exercise Discs. These slider discs are perfect for cardio and strengthening exercises to give your body a complete workout. Strength training can improve your running economy and these discs activate muscles of the arms, shoulders, back, glutes, core and upper and lower legs. The customized foot straps keep your feet securely in place as the discs slide smoothly across carpet and hardwood floors (use disc covers). The package contains 2 slider discs, 2 disc covers and 1 exercise program. The Pro-Tec Slider Exercise Discs are a great tool for getting stronger and fitter.