Build power, strength, and speed by improving your athletes explosive movements. The Leg Speed Builder adds versatility, portability, and resistance to any lower body exercise routine. Train specific running movements using this versatile exercise tubing that develops the legs, hips, and glutes. Multiple ring positions on the adjustable foot straps let you isolate and develop the muscles in the lower body. Work one leg or both at the same time. To apply resistance, secure the latex resistance tubing to a sturdy, fixed object or have a partner assist. Each 70" tube provides approximately 14 lbs. of resistance at 100% elongation and 20 lbs. at 200% elongation.