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 ...

Add Yahoo as a preferred source to see more of our stories on Google. “If you have time to do four or five, six triceps exercises, sure, we'll work some kickbacks in,” Samuel says. “But if you have ...