Sled dragging sprints are ok, but if you look at monster truck mud racing contests, you see that they use sleds with accomedating resistance, that gets heavier during the attempt (hey, sorta like bnechpress with chains). It would be nice if one could do sprints with a sled or chains or something that allows you to gradually get more resistance during the second part of the sprint. This way, you learn not only to be a fast starter, but also a fast finisher....