If you hope to excel in nascar this exercise is a must. All kidding aside, the ankle pump helps build strength on both the front and back side of the lower leg. It is a good warm-up for speed and agility drills. It also is a good "pre-hab" exercise to prevent ankle injuries and shin splints. If you play a sport, this exercise can be used at the end of a game to help the calf and shin muscles recover.