Mark Wahlberg: Shirtless For 'Pain & Gain'!

Mark Wahlberg walks around shirtless on the set of Pain and Gain on Friday (March 30) in Miami, Fla.

The 40-year-old buff actor showed off his toned physique as he listened to tunes on his headphones.

Pain and Gain also stars Dwayne Johnson and is directed by Transformers‘ Michael Bay.

The film is based on a Miami New Times article about a couple of bodybuilders who get caught up in an extortion ring and a kidnapping scheme that goes terribly wrong.

Look out for Pain and Gain, which is expected to hit theaters next year!