If you have seen any of the trailers for “Hercules” (due in theaters this Friday), you know that Dwayne “The Rock” Johnson got super jacked for that role. His biceps are wider than his head! The story he has been telling people while promoting the movie is that he worked out twice a day and forced down seven or eight meals. But the real secret to his gigantic muscles was revealed on “The Tonight Show” with Jimmy Fallon. Welcome to the wonderful workout world of The Fungo Brothers!