
The athlete learns that the external stuff is beyond their control. The weather conditions, the officiating, the injury to a team mate or a competitor; all impact the game or the race and none of them are in their hands. So, they learn how to accept the circumstance, the bad call, the injury, the rain or heat and, focus on what they can control.
And, as they do they discover that their true power comes not from insisting that things be different than they are but from how they choose to respond to what is.