Resistance burns calories quickly. If you step in the mud and your shoe gets stuck. You need more energy and apply more power to get your foot out of the mud. Same concept with swimming through water. This extra energy/power comes at a cost. Stored calories and sugars/energies you’ve consumed thus far. So when your body says it’s low it tells you you’re hungry. Your body is like a car’s gas tank, it has a gauge the lower the gauge the more your brain says put more in and keep going. If you run out, you need to rest/sleep so your brain will keep you hungry to keep your energy up!.
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