Jake Gyllenhaal Goes Shirtless, Bares Rock Hard Abs in Vegas!

Jake Gyllenhaal shows off his rock hard six pack abs while going shirtless for a boxing training session over the weekend at the Mayweather Boxing Club in Las Vegas.

The 33-year-old actor is pictured in these fan photos while training for his upcoming movie Southpaw, which is about a boxer who fights his way to the top, only to find his life falling apart around him.

PHOTOS: Check out the latest pics of Jake Gyllenahaal

Jake was also spotted by fans while attending the Pacquio vs. Bradley boxing match this weekend in Vegas.