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Beware: Ab Roller (Abs)

It's easy to use but it's easy to hurt yourself, says Ramirez. "People usually use too much weight and use just about every muscle except for their abs to bring it forward. They use their neck, back and legs instead of their abs." Fail.

Safer pick: Crunches

For a real challenge, try crunches on an exercise ball. Just make sure to pick the right size for you. A 55-centimeter ball works best for most women. You should be able to sit on the ball with your legs bent at a right angle, thighs parallel to the floor. Perform as many as you can in good form for two to three sets.

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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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