Tones chest muscles tone your chest muscles, arms, back and legs with fitness & athletics chest expander. a practical and reliable tool to improve your upper body strength, and increase your range of motions with flies, pulls, curls, and presses. adjustable resistance weight all 5 springs of fitness & athletics chest expander are removable to customize your preferred resistance weight. beginners can start with 3 springs and move up to 5 springs with a maximum resistance is of 30 kg. great home-based work-out fitness & athletics chest expander is a classic exercise tool that is easy to do at home without the need of gym equipment. it is compact, handy and can be done anywhere. 3-in-1 exercise target different muscle areas each time you use fitness & athletics chest arm expander. apply different techniques with this multi-purpose exercise tool that serves as a chest and arm expander, hand grip strengthener and pedal pull rope exerciser.