I don't think a physique is a necessity to be considered an action hero. I would consider Clint Eastwood, Bruce Willis, Mel Gibson, and even Charles Bronson as action heroes, but their physique doesn't necessarily jump to mind. For me, an action star was someone you'd go see the movie for just because they were in it, it was a must see movie for that alone. There are none of those today, aside from maybe Tom Cruise. The days of the movie star in general is disappearing for a multitude of reasons, I think.
Charles Bronson was a “big dude” in his prime…