Mark Wahlberg: Underwear Clad on Balcony!

Mark Wahlberg shows off his sculpted shirtless body in just a pair of briefs as he looks out over the balcony of his hotel room on Sunday (May 6) in Miami, Fla.

The 40-year-old actor is keeping his physique at its peak for his role in the upcoming movie Pain and Gain.

PHOTOS: Check out the latest pics of Mark Wahlberg

Mark has recently taken on a new project called Lone Survivor. It’s based on the failed mission “Operation Red Wing.” Four members of SEAL Team 10 were tasked with the mission to capture or kill a notorious Taliban leader. Marcus Luttrell (Wahlberg) was the only member of his team to survive. Lone Survivor is slated to come out next year.