Jake Gyllenhaal's Abs Are Totally Visible Through His T-Shirt!

Jake Gyllenhaal steps out with a mystery female as he heads out and about in New York City on Sunday (August 17).

The 33-year-old actor, who is playing a boxer in the upcoming flick Southpaw, actually showed off some of his boxing skills as he walked down the street, giving a left jab and right jab!

Southpaw also stars Rachel McAdams, Naomie Harris, 50 Cent, Forest Whitaker, and more! The film, about a boxer who fights his way to the top, only to find his life falling apart around him, does not yet have a release date.

10+ pictures inside of Jake Gyllenhaal showing off his majorly hot bod…