The actor said he spent "months and months" training for his big bar scene during a Q&A for the movie's SXSW premiere.Some actors do their own stunts… others do their own dancing.And if you ask Ben Affleck,

Ben Affleck holds various titles, and one that I’d argue should be acknowledged more is his “action movie star” moniker. The veteran actor possesses that distinction, in part, due to his lead role in The Accountant.