Retirement isn't generally an easy transition for anyone. Sure, the dream of not having to go to work every morning is real when you have to get up and go to work every morning, but after a while, that has to get boring, right?
And for pro athletes, it has to be even tougher. You've spent your whole life working towards one thing, and often, you're still pretty young when you suddenly don't have that in your life much anymore. So it's little wonder that the pros, and especially the elite performers, have trouble letting go.