Power
Remember when your mother got mad at you for doing something stupid that Mike did, and then she asked you if you'd jump off a cliff if Mike did that, too? Well, that's pretty much what being a stunt performer is like. Someone tells you to take a trip on the roof of a moving car, and you do it. They tell you to ride an angry bull, and you do it. They tell you to drink poison, and you do it. Hey, you need the paycheck. So you're not the one with the power. Even if you have bigger muscles than those who do have it.