For his role in the upcoming “Batman v. Superman: Dawn of Justice,” Ben Affleck has been working with trainers from his hometown, including Matt Damon’s cousin. Jamie Damon 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. The crew aren’t Hollywood trainers either, but hometown talent from the Institute of Performance Fitness, based in North Reading, Mass., near Boston.
