Matt Damon has shown off his impressive physique, including a six-pack, as filming begins on the fifth Bourne film.<br />Matt will reprise his role as CIA hitman Jason Bourne in the latest instalment of the action series, alongside Tommy Lee Jones, Alicia Vikander, Julia Stiles, and Vincent Cassel.<br />He has also co-written the adventure.<br />Paul Greengrass will return to direct the movie, following his stints behind the camera for The Bourne Ultimatum and The Bourne Supremacy.<br />It was his involvement that clinched Matt's decision to reprise the role, after Jeremy Renner took over as leading man in the fourth film, The Bourne Legacy.<br />The as-yet-untitled Bourne 5 will be released in 2016.
