Assume I exercise regularly, let’s say I work out on a Friday and then don’t work out the rest of the weekend.
Is the muscle built Friday night while I sleep? All through Saturday? During the weekend?
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None of these answers seems to answer “like your 5”
When you exercise, that stress of hard work is actually tearing the muscle apart in a bunch of tiny places all over.
Just like when you get a paper cut and you can see the blood start to pool there really fast, this starts to happen in the muscle tears the same way, basically. But the blood flow brings fresh proteins which fill in the tears just made in the muscle, this is how the muscle grows because now the tears are filled in adding more to your muscle.
It’s kind of happening all the time in a great circle of life way. Each time you eat and drink your refilling the stores of all the really complex but amazing stuff your body needs to rebuild itself.
But keep in mind too- your entire body is made up of cells, all cells have a lifespan and will end up dying. Some cells live hours, some days, some months, some like your brain stay your life time and die with you- but these cells are being replaced and rebuilt all the time as they die.
Exercise helps build muscle by causing those tears- but also helps your heart and blood carry and push oxygen around the entire body by beating faster because of the stress which is helping your cells rebuild everything else too, not just the muscle.
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