We all think that running is basically a lower-body activity but the fact is that the arm and upper body action is also required to balance the movement of the lower body. Your hands control the force in your upper body, while your arm swing works in conjunction with your leg stride to move you forward.
Now, it is clear that by improving the arm, you can actually increase your stamina and efficiency to run faster and longer. To improve the running arm swing, Byrdband developed a phenomenal Arm Swing Trainer for speed training, marathon training, track and field training, sprinters, and distance runners. The running arm swing trainer can be placed on the arms during the entire training which keep your arms at 90 degree angle and make your shoulder relaxed and squared. This incredible technique allows runners or athletes to create good running form mechanics which results them to run longer and faster.
* includes a thumb wrap around to eliminate hands crossing the mid line of the body