Caught up on some retro film & TV over Xmas, amazing to see a middle-aged Tony Curtis doing what looks like pretty dangerous stunt work himself! The shots where you can see his face are him, and this is pre-CGI so there aren't any safety wires or crash mats being hidden. Insurance etc would never allow this today
Curtis wasn't particularly known as an action hero, but in his younger days he was in a film about a trapeze artist, perhaps he picked up some skills there and kept in shape?
(This clip is from a series called "The Persuaders" from 1971)