The annoying person that can span from the age of 4 all the way up to 25. He or she, usually he, is the kid that would sprint around the gym/track when the gym teacher says a jog/walk.
Gym teacher: Ok everybody! We are now going to do a nice slow jog around the gym.
Athletic kid:*starts to sprint while laughing at everyone he passes, thinking he looks cool, but actually looks retarded*. (The gif. below is a good representation on what this kid looks like.)