Definitely working squats, and deadlifts help with power. My training partner, who can describe this much better than I mind you, has some of the frikkin strongest rotational punches (hooks mostly) I have ever encountered. My hand will go numb momentarily through focus mitts. He attributes this to his development of his legs and core through those exercises.
Sig courtesy of that photo-matic magician limba
I went out the way that I fight. I went out on my shield. That’s it. Done. --Chuck Liddell
My goal is to end my opponent --Carlos Condit