Expanding muscles are the muscles that open your hands. Lacking of training these muscles cause imbalances that hurt performance & can cause pain & injuries such as carpal tunnel syndrome and tennis elbow.

The compact & lightweight structure is easy to carry, it also folds up very small for storage. Used for home, office, even take it out for travel, camping, hiking etc. Perfect upper body exerciser: Arm, chest, shoulder and back Muscle Builder, training your whole upper body.