As the old adage goes, good things always come in threes, so it’s no surprise the most eye-popping muscle in your arms is, in fact, three parts that join together. 'There are three heads to the tricep ...

Good things always come in threes: fairy godmothers, parts of a combo meal, boy bands made of brothers (Hi Jonas and Hansen!). So it’s no surprise the most eye-popping muscle in your arms is, in fact, ...

What if we told you the biceps aren’t the biggest part of your arm? Everyone loves curling weights to get arms like Arnold, but they often forget it’s the triceps that make up of over 55% of the arm’s ...

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When it comes to building muscle, what you train can be just as crucial as how you train. You might be putting in the effort week after week, yet still falling short of the gains you’re aiming for – ...

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. Arm day can be one of ...

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