When most people think of bigger arms, their mind immediately goes to biceps. But here’s the truth seasoned lifters understand: your triceps make up nearly two-thirds of your upper-arm size. If you ...

The triceps — the forgotten halves of the upper arms. You might hear “welcome to the gun show” after a bicep pump, but rarely do you hear a clever quip about the triceps. Nevertheless, they’re ...

If you tend to walk right past the cable machine at the gym, listen up. While you can always work your triceps with a set of dumbbells, the cable machine is an excellent way to isolate your arms and ...

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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 ...