Where performance is concerned, research shows a little mental rehearsal can go a really long way. There’s a scene in Wolf of Wall Street in which Matthew McConaughey hums and thumps his chest.

Warming up before exercise may not increase your overall strength, but new research shows it gives your muscles the speed and explosive power needed for rapid movements. Study: The effect of muscle ...

The humming and chest thumping wasn’t in the script, though. As McConaughey explained on the Graham Norton Show: That’s something I’ll do before scenes to relax myself … to get out of my head. I was ...