Yup, this minor muscle group on the back of the arms is the key to overall fitness. "The triceps are a super, super important muscle group," says Jacquelin e Kasen, CPT, a Miami-based coach and ...

Return it back down slowly and repeat. Why: Often neglected because it works the brachialis, an invisible muscle lower down your upper arm — but one essential for bigger biceps. Train it well ...

Lift your arms, chest, and legs off the ground simultaneously, holding for a few seconds to strengthen the lower back muscles. Lie on your back with knees bent and feet flat on the floor.

Pause, then lower legs and bend arms to sides to return to starting position. That's 1 rep. Why it rocks: This is a great move for people who want to strengthen their lower back muscles.

If we think about moving some muscles, like our arm muscles, they move. Other muscles, like our heart, move on their own without us thinking about it. Muscles often work in pairs, pulling on your ...