"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." ON THE BACKSIDE of each of your upper arms is an unsung hero. With the right amount of consistent, ...

Add Yahoo as a preferred source to see more of our stories on Google. Man performing dumbbell overhead triceps extension in mirror. Take a look around at your fellow gym-goers next time you visit the ...

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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 ...

Building muscle in your arms requires focusing on the biceps in the front and the triceps in the back. They’re opposite functioning muscle groups, so they require different strength training exercises ...

Anyone interested in building lean muscle will love this method.

While having toned biceps is certainly a flex—literally—that’s not the only muscle you should work on arm day. To build all-around upper-body strength (oh, and gain even more muscle definition in your ...

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 ...