3 in 1 Tension Expander build your pectoral muscle, strengthen your power in fingers and arms,which exercise your arms,shoulders,back,legs,abdomen,waist or other muscles of the body. Adjustable tension stregth to your whole family,suitable for home,offic,gym and fitness etc.Features:3 in 1 design: Arm & Chest expander + Sit-up bars + Hand gripper.Exercise your arms,shoulders,back,legs,abdomen,waist or other muscles of the body.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.Max.15 kilograms load for each spring.Ergonomic handles and comfortable pedals for perfect fit.Detachable and foldable design for easy storage and carry.Great for home,fitness,yoga,fitness classes,physical exercise etc.Specification:Color: Black & Red / Yellow & Green (optional)Material: PP&Stainless SteelSize: 70*34cm/27.6*13.4inPackage weight: Approx. 1150g/2.5lbsPackage size: 38*15*7cm/15.0*5.9*2.8inPackage List:1* 3 in 1 Spring Expander