Ben Affleck has hired pal Matt Damon's cousin to help him get into top shape for his new role as Batman in the Man Of Steel sequel.

Affleck has recruited a group of top fitness instructors from his native Boston, Massachusetts to help him bulk up for Batman vs. Superman: Dawn of Justice - and one of them is Damon's relative Jamie.

All the trainers have one thing in common - they're all from the Institute of Performance Fitness in North Reading, Massachusetts, according to The Hollywood Reporter.