Ben Affleck Recruits Boston-Based Training Crew for 'Batman' Beef-Up

Ben Affleck as Batman Twitter pic - H 2014

Ben Affleck as Batman Twitter pic - H 2014

For his role in the upcoming "Batman v. Superman: Dawn of Justice," the actor has been working with trainers from his hometown — including Matt Damon's cousin.

This story first appeared in the June 6 issue of The Hollywood Reporter magazine.

A Damon helped Ben Affleck get the big muscles he's attained for his role in Batman vs. Superman: Dawn of Justice.

Make that Jamie Damon, one of Affleck BFF Matt Damon's first cousins. Jamie is among a group of trainers, including Affleck's main sweat sergeant, Walter Norton Jr., who have been training the actor both in L.A. and on set for the superhero part.

PHOTOS: Tracking Batman From His Goofy Beginnings to Modern Mettle

The crew aren't Hollywood trainers either, but hometown talent from the Institute of Performance Fitness, based in North Reading, Mass., near Boston.

Matt calls Jamie "a stud of a trainer."