This shape-up is smart.

How it works:You’ll do an ab firmer, then a card move to burn fat.

Try it:Do two 8-minute rounds, performing each move for 1 minute.

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© Condé Nast

Squeeze the routine in four times a week and you won’t be squeezing into your swimsuit this summer.

Engage abs and sit up, bending knees as you reach hands to toes (as shown).

Return to start; continue for 1 minute.

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Hop feet back up to hands and jump, raising arms overhead.

Repeat on opposite side.

Continue for 1 minute.

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Bring right knee to chest, then return to start.

Bring right knee to right elbow (as shown), and return to start.

Repeat on opposite side.

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Continue for 1 minute.

Continue for 1 minute.

Lie faceup, legs extended, arms above head.

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Raise and spread legs wide, then sit up, reaching hands between thighs; return to start.

Tuck knees in and reach fingers to toes as you sit up; return to start.

Continue for 1 minute.

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Continue, alternating legs, for 1 minute.

Continue for 30 seconds; repeat on opposite side.

Works: abs, butt, legs

Lie faceup with legs extended, hands behind head, elbows out.

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Stand, then reverse move to return to start.

Repeat on opposite side.

Continue for 1 minute.

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