When it comes toworking your absthere is such a thing as too many crunches.

From quick and cardio-driven moves to slow and Pilates-inspired burners, here those core-sculpting exercises top trainers love.

Criss Cross 20 reps

The expert:Cassey Ho, founder ofBlogilatesand thePOP Pilates method.

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Try it:When twisting, imagine you’re bringing your opposite shoulder and knee to touch.

Do 20 reps, alternating directions with each rep.

See more of Ho’s top abs exercises here.

Keep abs engaged as you jump feet out to sides (as shown), then back together.

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Step foot back, hop feet toward hands and jump up, clapping hands overhead.

Immediately squat, jump back and repeat, alternating sides.

Do 15 reps.

Get Bob Harper’s five-minute morning workout here.

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Rotational Plank 15 reps on each side

The expert:Los Angeles-based celebrity trainer Astrid Swan.

Try it:Start in side plank with left forearm on floor and right arm extended to ceiling.

Keeping hips lifted, rotate torso, bringing right arm under body then twist back to neutral.

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That’s 1 rep. Do 15 reps on each side.

See another one of Swan’s killer abs moves here.

Step your left foot back on a diagonal and reach your arms up and to the right.

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Do 15 fast reps, then switch sides.

Keep your spine long and core tight.

Hold this pose for one minute.

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See more moves from McGee here.

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