You have to respect that the he stays in incredible shape year round (actually he has been on television week-in-week-out for well over 10 years now and has maintained his conditioning). Plus the fact that he lives on the road, wrestles several matches a week/media appearances and has had some major injuries along the way (torn pec, broken neck etc.).
It is remarkable how he (or any of the other pro wrestlers really) manage to keep a nutrition and training regime, their bodies must feel like crap most days.