Why can’t we eat and lose calories.. LOL
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Humans are extremely energy efficient. Running and walking is extremely energy efficient method of movement for humans. Our bodies evolved to do it. How to move around you need a fairly small amoutn of your cells; however every single cell in your body has to use energy to stay alive. That is what it really boils down. Everything from digestion to breathing takes quite bit of energy and you do it way more than runing.
If you truly want a form of exercise that burns lots of energy, go swimming. Our bodies aren’t meant to swim. We don’t have naturally bouancy, nor can you rest against anything in water. When you stand with the correct posture your all your body needs to do is to hold the head on top of the spine, spine straight, and legs straight and you transfer your whole body weight down to your heels. After that it is just minute adjustments for balance. However in water, you have nothing to transfer your body weight to, if you stop moving and adjusting you sink. Because in water all parts of your body has equal resitance against movement, all of your muscles will have to engage to adjust your body.
However humans can drop the calorie requirements dramatically. In high stress situations like in a cold environment and low food supply your whole body will just basically start to be in a form of hibernation. However you will also start to gain weight as body wants to put everything it can in to reserves.
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