Humans can streamline their bodies as well. If you have ever watched the sport of speed skating you have seen examples of this. Speed skaters skate in a lowered position, with their back as flat as possible and one arm put as close to the side and as far back as possible. This streamlined posture allows the skater to cut through air resistance more efficiently and more quickly. Speed skaters also wear a form-fitting Spandex outfit. Believe it or not, this actually contributes to speed because there is no loose, flapping clothing adding resistance. It is actually faster to skate in the suit than it is to skate naked, because even your body hairs can add to resistance. And it would probably get a little cold! For this same reason, competititive swimmers shave off all body hair and either shave their heads or wear a streamlined swimming cap.