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How long can you hold a plank — and how does it stack up to others in your age group?

That’s the question that was posed on "Fox & Friends" Thursday morning, when co-hosts Brian Kilmeade and Lawrence Jones competed in a plank challenge.

A plank is an isometric move where the person holds a push-up position for a set period of time.

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Both held a low plank for well over a minute, exceeding the thresholds for their ages, although Kilmeade held his for a few seconds longer.

A fitness expert at Lifetime in New York City provided the below targets for how long you should be able to hold a plank by age.

20s: 1 to 2 minutes

30s: 1 to 2 minutes

40s: 1

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