Agreed with those saying Toney. Even when he's 400 lbs he doesn't gas easy, because he's so relaxed in there, he doesn't expend any nervous energy at all. Miguel Cotto at times seemed very relaxed, he looked like he wasn't even trying against Alfonso Gomez but was still beating the crap out of him.
Joe Calzaghe always seemed to me relaxed in the ring. Despite getting knocked down he would pick himself up and box on. I would add Lennox Lewis. Supremely confident and relaxed.
I never thought of a fighter as being relaxed unless he was on his back on the canvas.. I think it's impossible to relax and move around, throw punches and get hit at the same time.
He was smiling on the first knock down knowing he blew it and should have actually trained for that fight instead of partying.
Three welterweights all from the same era had beautiful relaxed styles. They are Hedgemon Lewis, Harold Weston and Angel Espada.