Glenn Verniss Cunningham has a very inspirational story in which he was told that his  leg would no longer functional and there he goes and proves everybody wrong and by pushing himself into giving his all in something he believes he can do and does very well. This just proves that anything you set your mind to you are capable to accomplish by not giving up and just keep pushing until you are satisfied. Nobody should have an excuse for not being able to do something because there isn't any excuse for anything but yourself.