Pseudois Vertical Jump Trainer Leg strength training strap Leap Training Resistance Bands 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 are very helpful with rubber foot ring / ring is adjustable wrist, snap Department can add more elastic rope to increase resistance. Package includes: 2 × 24cm resistance band 2 × 30cm resistance band 1 × adjustable waist belt 2 × ankle strap 1 × carrying bag