The arms are one group of muscles you can always rely on to make you look strong, with or without a shirt on. Big, defined bicep peaks elevate your physique, which is why guys never stop chasing the ...

If hammer curls are in your weekly programming, it may be time to check your form because bodybuilding champion Charles Glass says you're probably doing them wrong. Glass, often referred to as "the ...

Whether you're looking for raw strength or pure size, the spider curl provides the constant tension to get you there ...

A strong bicep can create that defined look in the upper body that many people desire. But what most people don't realize is how important strengthening this area is for reasons beyond aesthetics. The ...

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 ...