Sports Injury Clinic explains that exercises for a broken arm include isometric triceps and biceps contractions, partner-resisted triceps and biceps exercises, biceps curls and triceps kickbacks with bands, and assisted biceps and triceps stretches. The specific choice of exercises depends on the stage of rehabilitation.
According to the American Academy of Orthopaedic Surgeons, the first exercises to rehabilitate a broken arm are gentle range-of-motion exercises that strengthen the arm. Drugs.com mentions wrist bends, wrist rotations and palm-up-palm-down exercises as possible choices to extend range of motion in the arm.
Sports Injury Clinic explains that exercises for an arm injury will progress from early to late stage exercises as the recovery continues. Late stage exercises, which use weights, resistance bands, pronation-supination bars and exercise balls, can be used as maintenance exercises for those whose injuries have healed enough to allow them to return to sports.
As the American Academy of Orthopaedic Surgeons points out, broken arms can take three to six months to heal fully, depending on the severity of the injury. Physical therapy and rehabilitation typically begin with range-of-motion exercises after any cast is removed, then progress toward strengthening exercises. Anyone with a broken arm should wait for a doctor's okay before returning to sports activities.