New behind-the-scenes video from Mark Wahlberg’s The Fighter

In The Fighter, Mark Wahlberg plays Boston boxer “Irish” Mickey Ward, a fighter who was losing bouts and about ready to hang up his gloves when his brother, Dickie Eklund (Christian Bale), came back into his life. Eklund, whose drugs and robbery spree drew him a 10- to 15-year sentence in state prison, kicked the drugs, became a model prisoner and emerged as a changed man who helped his brother reach the glory that eluded him.

Also starring in the David O. Russell-directed film is Amy Adams, Dendrie Taylor, Jack McGee and Melissa Leo. The Fighter is due in theaters sometime in 2010.

Check out the video clip below, featuring Wahlberg discussing why The Fighter was one of his passion projects, growing up in a tough neighborhood, along with peeks at his training sequences as he prepares for the role.