How does swimming burn so many calories (close to higher intensity workouts) even if my heart stays in the warm up zone the whole time?
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Swimming is a decent full-body workout, but it also means you’re immersed in water that’s significantly below your body temperature. Water is far more thermally conductive than air, and it has a very high specific heat, so it rapidly cools you down. Your body then has to raise its metabolic rate to keep you warm, and that burns calories.
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