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So a lot of us see the six-pack as one of the ultimate signs of being physically fit. But also for a lot of us, we see it as almost next to impossible to achieve. Gregg Cook of Equinox says you can do it and there's actually a science behind it.

"The science behind the six pack is ultimately about acheiving a core or a musculature around your spine that not only supports and stabilizes the spine but also is mobile," says Cook.

Some of his tougher moves guaranteed for ripped abs once you've had some serious experience include flexion or bending moves like leg lifts on a pull-up bar, a headstand where you slowly move your legs from side-to-side for a lateral flexion move, and pull-ups with a Kung Fu kick for a rotational ab move.

Until you can work up to any of that, you might want to get started with a stability move called the star plank. Then there's the "Roll Back, Jump Up" mobility move.

This one is all about basically breaking your fall, rolling gracefully and getting right up again," explains Cook. "So you are going to take most of your body weight on the back leg. Roll down, round the spine, tuck your chin. Roll it back up drive to that standing leg."

You can try topping your six-pack workout off with an opposite leg, opposite arm extension exercise.

To view Cook's six-pack tutorial for free, visit q.equinox.com