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, ...

If you want to sculpt a killer set of triceps — the muscles on the back of your arms — look no further. These pushup variations are all you need to get moving. Plus, we’ll show you how to perfect your ...

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 ...