Feature:1. 3 in 1 design: Arm & Chest expander + Sit-up bars + Hand gripper.2. Exercise your arms,shoulders,back,legs,abdomen,waist or other muscles of the body.3. 5 elastic stainless steel springs with convenient hooks can be added or removed to adjust different tension stregth for the whole family.But it is recommended not to have less than three springs.4. Maximum 15 kilograms load for each spring.5. Ergonomic handles and comfortable pedals.6. Detachable and foldable design for easy storage and carry.7. Great for home,fitness,yoga,fitness classes,physical exercise etc.Specification:Specification: Color: Black & Red Material: PP&Stainless SteelSize: 70*34cm/27.6*13.4inPackage weight: Approx. 1150g/2.5lbsPackage size: 38*15*7cm/15.0*5.9*2.8in.Package List:1* 3 in 1 Spring Expander