Here's the perfect tool to tone and strengthen all the muscles of the lower body in just minutes each day. Creative, easy-to-use, multi-directional movement activities put the FUN back into exercise. The combination of spri tubing and comfortable, no slip ankle cuffs has created a product that turns any lower body movement pattern into a safe and effective resistance exercise activity. Available in extra-light, light, medium, heavy, and extra-heavy resistance levels. Color according to resistance level.