born with it. Your chin can be improved slightly though through neck training, experience, conditioning
http://www.youtube.com/watch?v=zvQTyHE2c5M [yt]zvQTyHE2c5M[/yt] http://www.youtube.com/watch?v=__H8S_4Zk8o [yt]__H8S_4Zk8o[/yt]