It's extremely hard for athletes to accept what's happened to them sometimes. It's hard to be beaten by a small margin and I've spoken with athletes who for years afterward have been tormented by the knowledge that had they done something ever so slightly different they could have been one-ten-thousandth of a second quicker.
Training is full-on. Some days I really don't want to get out of bed and hit that track again. Sunday and Monday morning sessions are always horrible. But who really looks forward to going to work on a Monday morning?