The Speed Trainer has been proven to increase speed in documented university studies, and is used by many pro teams. Speed Trainer offers resistance to the key muscle groups during training and helps to maintain the athlete’s pure running form. It also strengthens the hip flexors and upper quadriceps for maximum recoil speed. Adjustable for all training levels with 1, 2 or 3 weight bars per leg (1 lb per bar). Includes neoprene waist belt and 2 thigh wraps, 6 weight bars, 12 end caps, and an instructional manual. One size fits all.