Lots of tough guy actors are known to do their own stunts. Like Clint Eastwood with the climbing scenes in The Eiger Sanction. Viggo Mortensson did all his stunts in the LOTR trilogy. Arnold did a lot of his own stunts. One thing I wish to know is whether it was actually him jumping off the waterfall in Predator? Anyone know for sure?
Sunil Shetty also used to do his own stunts but because of his high market value producers stopped him doing stunts.
Jackie Chan does his own stunts. Really love the bloopers after his movies. He is much of a comical character too.