The verb "Try" means to attempt something. The verb "Do" means to achieve or complete something. Try has a built in level of failure. If we attempt to do something and don't make it we can always say we tried. It makes it too easy to quit. If we attempt to do something with the attitude that we will "do it", we will keep trying until we achieve it. Trying is just one of the steps to doing something, not the goal. Simple things like this can alter our player's mindset and help them perform at a higher level.