Elemental
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Elemental

The Science Behind the New 4-Second Workout

High-intensity routines are brief and effective but not easy

Woman working out in her living room.
Photo: Oscar Wong/Getty Images

Researchers are racing to figure out the minimum amount of exercise needed to improve fitness and health. Findings in multiple labs have generated tantalizing headlines suggesting all you need is one lousy minute of effort or, based on one new study, a mere four seconds.

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