A highly effective yet simple resistance exercise device that can be used to treat Tennis Elbow as well as giving improved mobility and strength to wrists, hands, forearms and shoulders.A ridged surface gives the Flexbar user better grip, making it easier to perform exercises like wrist abduction and thumb strengthening. Theraband is a highly respected brand that is used and trusted throughout the NHS. There are four different colours of Theraband Flexbar, each offering a different level of resistance. The Blue Flexbar gives the most resistance.