This dynamic cable variation is turning heads in U.S. gyms for its ability to fire up multiple muscle groups in one efficient movement.

IF YOU’RE LOOKING to blow up your arms, you've got plenty of training tools in your arsenal. You can use hammer curls, preacher curls, and of course, the tried-and-true standing biceps curls. All of ...

Hold a cable bar with underhand grip, shoulder width apart. Use your biceps to flex your elbows and raise the bar to your shoulders. Lower it back down to your thighs and repeat.