Intensify explosive plyometric and vertical jump training with this portable power jumper that improves acceleration, muscular force and athletic performance across a wide range of sports and physical tests. It can be paired with weight training to add resistance to eccentric contraction for improved training efficiency and greater muscle development during leg exercises like squats, lunges and deadlifts. Includes two 5 ft. cables with 40lbs. peak resistance each and two 5 ft. cables with 70lbs. peak resistance.