VTD 151 character sketch final

How does a person draw the character trait self-discipline?When I think of the self discipline I think of an athlete, because of all the hard work they have to put in.But specifically I think of a body builder because they have the self-discipline to not drink and eat junk food as it will affect their overall physique and that's important because there goal is to have the best looking physique when they complete.
self discipline is defined as the ability to control or over come one's weakness
or another way of putting it, the ability to pursue what one thinks is right despite temptations to abandon it.
Both definitions are fit for a bodybuilder because thee are so many temptations but having self discipline a bodybuilder just pushes onward