Desccription:1.Play a very active role in the basketball and volleyball training jumping sports2.Bounce trainer training device Leg strength and agility training strap3.From a biomechanical point of view to improve the leg strength to do anything you can do to achieve the squat action or participate in any sport、 for enhancing the jump、 speed and strength with adjustable rubber foot ring4.Elastic rope length 30 cm、total length 40CM5.40 pounds pulling force per rope、 2 ropes 80 pounds in totalPackage include:1 x Adjustable elastic waistband2 x Ropes 2 x Adjustable ankle straps