Shouldn’t it be the other way around?
In: Other
When you do nothing, your brain thinks “well, I guess we are done for today, time to stop making energy”
When you work out, your brain thinks “Oh man, we are doing stuff! I gotta make more energy!”
Exercise releases hormones (endorphins) that make you feel happier and more energetic.
It also gets the heart pumping and blood flowing, which is how your body gets what it needs to function. Sitting does the opposite.
For the same reason that a car parked for ten years will run worse than one running every day.
Nobody is taking care of it.
Sitting around doing nothing is similar to what we do when we’re going to bed. Doing nothing is a great way to conserve energy, if you’re sitting around doing nothing it’s fairly likely you’re in a safe place to rest.
Imagine the body is like a car. Once it gets going and starts to warm up it takes time to cool down after it stops. Our heart rate remains elevated, respirations elevated, we continue dissipating heat, hormones are still flowing through your blood, ect. From an evolutionary perspective it would make sense that we don’t become tired from exercise. In a predator/prey situation it would make very little sense for either the prey to be tired while escaping from danger or the predator to get tired while chasing possible food
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