There’s something powerful about closing out your week with purpose, and that’s exactly what the Flex Friday Finisher delivers. Inspired by classic bodybuilding strategies and modern strength science, ...

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 ...

Any gym-going female human knows just how much men like to show off their muscles. But it turns out that it’s not just male humans who think that flexing their biceps at ladies is an effective ...

Get ready for the ultimate pump.

To work your biceps, you'll mostly need to do exercises that isolate the muscle and force it to flex and supinate under load. That might not be as efficient as your training plan for some other ...

Your biceps also supinate the forearm (turns it to face upward). And when you train your biceps, you can't neglect the brachialis, the muscle the sits beneath the biceps and generates even more flex ...