The film, directed by Josh and Benny Safdie, features Pattinson, 31, as a small-time criminal who attempts to race against the clock to break his brother out of prison after a botched bank robbery.
In a conversation to The Hollywood Reporter, Pattinson said after shooting the film, "I'm more confident in my body than I used to be. It's something about growing up as an English person - you're very physically inhibited.
The directing duo too is all praise for the "Twilight" actor.
"He said to us, 'I'm willing to do whatever it takes,' and we took him at his word times a hundred," said Benny.
Josh added, "He didn't complain once, and his trailer was a minivan that sometimes doubled as a Steadicam dolly.