BUILD YOUR MUSCLE WITH BODY BUILDER, WE ASSURED THE QUALITY AND DESIGN FIT IN YOUR REQUIREMENT IN YOUR DAILY EXERCISE. 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 dosi firming buttokcs. Girls can use this exercise to have thin arms, breast enlargement, this waist, abdomen, lifting leg lines, firming buttocks. Anti-pulley bottom, elastic rubber rope, professional skid plate. Material: ABS/PP, Hose: high elastic elastic tube