Ten minutes a day, 6 levels of force can be adjusted, step by step let you change
Boys can use this exercise to have eight pack abs, arm muscle lines, latissimus dorsi, firming buttocks.
Girls can use this exercise to have thin arms, breast enlargement, thin waist, abdomen, lifting leg lines, firming buttocks
The material is latex, good elasticity, strong and long service life. It can adjust the length of the rope and adjust the tension by the hole position at the bottom of the raft.