Isokinetic testing and training harnesses the power of computer technology to gather information about, as well as exercise, specific muscle groups. Physical therapists can then use the information they gather to develop effective rehabilitation programs for their patients. This technology is effective in evaluating and training muscle function in the shoulders, elbows, wrists, hips, knees, and ankles. Isokinetic testing machines typically are loaded with software that can evaluate limb speed, power, work, and acceleration. Therapists can then compare the data they gather on the affected extremity to that of the unaffected extremity to get a sense of the severity of the injury or condition. When used as a training mechanism, the machine combines the benefits of both isometrics and weight training by providing muscular overload at a constant rate while monitoring the exertion of the user. This greatly decreases the risk of injury or re-injury, particularly as the patient prepares to begin—or return to—a traditional exercise regimen. The machine also helps improve patients’ range of motion and balance. This technology is applicable to a wide range of patient populations and is currently part of the official rehabilitation programs of dozens of professional sports organizations, including teams in the NFL, MLB, and NBA.