When it comes to strength training, I am usually a free weight kind of gal. Then I learned to love the cable pulley machine. I was still looking to branch out a little more, so my trainer Hannah introduced me to the Smith machine. Essentially, the weight machine consists of a barbell that slides on a fixed rail, and can lock into place at the fixed points along the track. Twisting the barbell activates J-shaped hooks on the side of the bar that lock into holes on the rails. This simple locking mechanism turns the Smith machine into a "spotter," making it easier to work on hardcore moves like bench presses when you're alone at the gym. The Smith machine only moves in the vertical plane, which makes some exercises harder on the joints. Although squats seem to be a popular exercise to do using this machine, many fitness experts think the fixed plane of motion of the machine forces the body into compromising positions. You can still use this machine to get a full body workout, and by locking the bar you can do variations on incline pull-ups and push-ups.

While I always think of the Smith machine as something for gym dudes, I am keen to learn more. If your gym has this machine, ask someone to show you how to use it. See if they can teach you a few different types of exercises with it.