last time i sprinted, i was going as fast as i possibly could and it seems like my legs couldn't keep up with my speed and i fell... badly. im not sure if you guys know that feeling of when u cant keep up with you're speed but its hard to explain. how can i avoid falling? if you want an example of what happened the girl in this vid fell the exact same way i did: http://www.youtube.com/watch?v=6aaQRBetrpU