Because it's apart of their History.
It is important for teens to eat well because they are growing and need energy and they need to stay healthy.
Playing hockey when the ref said it was my goal and it wasn’t so I told the ref it wasn’t my goal.
Okay, this is an interesting one but mainly no, most activity's will so you don't push yourself but if you really wanted to you could go for however long you want as long as you are not doing harm to your body, depending if you are on a fitness program there will be limits.