VIDEO. (Time lapse this down to 20 seconds.) Travel across the narrow part of a level football field (or the equivalent of 150 feet on level grassed ground). You cannot touch the ground with any part of your body and you cannot have anyone push or pull you. You’re only allowed to use a skateboard, two pieces of string or rope no more than 5 feet long each and a clothespin. (NOTE: You can’t use the clothespin as an extension of your hand or foot to push you along the ground.)