Dwayne Johnson has revealed that sex is the reason for his buff body in 'Hercules'.

The 42-year-old actor said that one should find an activity that one loves doing like biking, hiking, pilates, horizontal hula and then one should let it sink in, the Mirror reported.

The American actor added that he enjoyed pigging out once the movie had wrapped, saying that Sunday domination is what it was called which included pizza, brownies and pancakes.