One of the most important arm muscles is the triceps brachii (the triceps, for short). You use your triceps to extend your arm. It opposes the biceps muscle, which is used to flex the arm. You also ...

When people think of having strong, toned arms, they tend to focus mainly on building biceps—the meatier part of your arms. But the triceps—the three-headed muscles in the back of your arms—are just ...

The triceps are the biggest muscle in your arms, but they can be difficult to train and grow when compared to the more celebrated biceps. But Jeremy Ethier, kinesiologist, fitness trainer, and founder ...

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 ...

If toning the back of your arms is a goal, strengthening the triceps can help eliminate that common trouble spot that jiggles when you wave and help you feel more confident. But even more important, ...

Want to build more defined-looking arms? You need to prioritise doing tricep exercises as they actually make up the majority of your arm (60-70% of it in fact). These exercises will do just that by ...