Unleash the might of Powerball on your legs! Given the overwhelming results seen, with the use of Powerball, for arm training, conditioning and rehabilitation you can see now how the same principle of exercise can be used so effectively in training your feet and legs. Simply start your Powerball and place it in the Foot Trainer for an amazing workout on your feet, ankles and legs. It is a great training/rehabilitation device for footballers or for people who have broken ankles in the past.