But for all his many and varied roles, his mantra is the same: Dont be boring.
Dont make boring acting.
Ruffalo revealed his approach during a conversation aboutSpotlightwith EWs own Jessica Shaw for the SAG-AFTRA Foundation on Monday.

Credit: Kerry Hayes/Courtesy Everett Collection
You want it to feel alive and spontaneous, and so you have to do all that work.
… What Im trying to do is not be boring.
To bring that guy to life but not feel like its just an imitation.
On that last topic, he returned to the B-word.
I get bored of stuff quickly, especially myself, Ruffalo said with a laugh.
Which is why Im an actor, probably.
Spotlightis in theaters now.
Watch Ruffalos interview above.
Footage provided by the SAG-AFTRA Foundation.