“You end up using every bit of energy you have to get from point A to point B when you’re swimming,” says Herman. “You also kind of trick your brain because you’re tiring out your body, but the water makes it tough to feel sweaty. Plus the pool keeps your core temperature down, which means you might be able to last longer.” His suggestion is to alternate laps of easy paces and sprint paces to get your heart rate up while allowing you to stick it out in the pool.

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