When it comes to guys hitting the gym and crushing a solid upper body workout, no muscle is more synonymous with strength (and physique) than the biceps. The iconic "flex" pose? That's your biceps ...

Get ready for the ultimate pump.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Curls are the classic ...