The Accelerator harness is focused on the first 30 feet run by the athlete, which is during their acceleration. The adjustable padded harness is large enough to fit over shoulder pads but can adjust small enough to fit young athletes, making it suitable for youth speed training as well as adult speed training. The tubing has a fabric sleeve that protects against injury as well as against overstretching and wear and tear. The harness is available in 2 resistances, beginner and advanced. The Accelerator focuses on the specific muscle groups needed for stamina and speed for up to 30 foot distances. Includes: harness, 10' resistance tubing, anchor. 2 different resistance levels: 105 lbs. (beginners) and 150 lbs. (advanced).