Many runners might not recognize the need for efficient and powerful arm movements in their sprinting. Many of these runner's drills focus on leg motion instead of efficiency of movement in the entire body. Power Systems 10345 sprint trainer helps fix that. This trainer features a resistance band and arm cuff that attaches to the upper arm and between the thumb and the rest of the fingers. By so doing, this sprint trainer forces the arm into a powerful bend that will help the runner drive their bodies forward when swinging their arms, improving overall speed. Order your Power Systems exercise equipment here.