"We trained in combat and weaponry," Powell said in an interview for The Running Man. "I realized I had to put my body on the ...

Lie with your stomach on an incline bench, holding dumbbells or a curl bar with your arms straight below your shoulders. Drop the weight down low and really focus on the eccentric (lowering) portion ...

You might be surprised how much you're already hitting this valuable muscle group. Here's how to avoid going overboard.