Sylvester Stallone is 60 years-old, yet in the latest Rocky movie, he whips off his shirt and manages to look like a legitimate heavy-weight boxer. How did he do it?

Work. And carbs. Stallone was in the gym five days a week, and boxing six days a week -- up to four hours daily. He ate "a lot of pasta. [And] a lot of protein drinks, a lot of supplements."

Sounds pretty rough, but, judging by the film's success, it seems like Stallone created the right look for his iconic Rocky character's big comeback.

However, you should know that this is not a healthy way to bulk up. In fact, Stallone adds at the end of his interview: "Do not try this at home or anywhere!"