Regular exercise makes your muscles and your heart stronger. When you’re stronger, it takes less effort to finish your regular day-to-day tasks. This makes it seem like you have more energy leftover after doing your regular tasks. This goes for intentional physical activities as well as just being alive (I.e. having a beating heart).
It may help to think of this in reverse. If you’re in great shape, you get used to doing a lot during the day. If you were suddenly out of shape, you’d have difficulty keeping up with your former, fit self.
There is also a mental aspect to it. A lot of jobs today are sedentary. We all use computers, cell phones excessively. This all puts us very much in mental realm, partially dissociated from physical, real world. Excersise forces out of overthinking realm and into the level of physicality, aliveness. Our body kind of wakes up from turni g attention into it. Also the feeling of body aliveness becomes more noticable with high blood pressure, heart rate and breath rate.
Basic answer is when you exercise, your body needs more energy by the minute. Your body increases your metabolism to use the stored energy.
When you stop exercising, your body doesn’t instantly know it and you actually get a lengthy residual metabolism increase relative to what you think of as sedentary “Basal Metabolic Rate”.
Also, you can effectively increase your BMR if you exercise consistently.
If you exercise or do anything physical your body goes “alright, I guess we’re doing this now” and goes from producing energy to sit on a sofa and eat doritos to running a mile. Obviously you need more energy to run a mile so your body’s like ” okay this isn’t what we usually do but cool I can deal” so it produces alot more energy than it usually does, doing this contributes to feeling tired. Because when you’re tired you literally have run out of energy.
Now your body isn’t dumb, it’s a slow but sure worker and if you decide to run daily it’ll change its energy production protocol from I need 20% more energy once a while to frequently. This is why you have more energy if you’re active and lead a non sedentary lifestyle and also why your stamina increases.
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