Golf at the professional level involves every part of the body working in unison with grace and power, coordinated by a clear and undistracted mind. Age and experience can change your perspective about trying to "limp along and win tourneys" as if an injury was no big deal. Tiger gutted out the final round of the 2008 U.S. Open - and won - with a knee injury that would have crippled most men. In the process he made the injury much worse, and he hasn't been quite the same since. Regardless of what anybody thinks of Tiger Woods personally, he has nothing to prove in the Guts Department.