Most men stick to dips and overhead extensions when it comes to working their triceps. If you want another option in your arm-sculpting arsenal, try the uneven plank -- a core exercise that does double duty as a triceps builder. "Unlike the standard plank, you'll lift one forearm off the floor," says BJ Gaddour, C.S.C.S., creator of 10-Minute Torchers. "Now your arm is holding the bottom position of a pushup, which instantly activates your triceps." The longer you hold the exercise, the longer your triceps will be under tension. The result is more muscle growth. But fair warning: Your triceps won't be the only muscles screaming. Since you're balancing on only one forearm instead of two, your entire core has to work overtime to stabilize.
Ready to try this triceps-pummeling, core-carving move?
(Test your strength and pack on more lean mass when you Pull Your Own Weight with this ultimate old-school circuit.)