January 3, 2013 - 8:37am by McCarton
If this isn't motivation to start hitting the gym in 2013, we're not sure what is.
52-year-old Sean Penn showed off his absurdly ripped body while hitting the beach yesterday in Maui. He might want to invest in a shave and a haircut, but if nothing else, just scroll down on the photo so you can't see his head.
What else will we be seeing Sean in over the next couple of months? Find out after the jump!