Jake Gyllenhaal Bulges His Biceps

Jake Gyllenhaal shows off his muscular arms while shooting a running scene for his new movie Love And Other Drugs on Wednesday (September 30) in Pittsburgh, Penn.

The 28-year-old actor caused all kinds of traffic jams as people stopped to watch!

Jake Gyllenhaal reunites with Anne Hathaway, who co-starred with him and Heath Ledger in Brokeback Mountain.

10+ pictures inside of Jake Gyllenhaal bulging his biceps…