Well, most say that the muscles cells are broken than and repair starts. That is scientificly bullshit.
It's refuleing time instead. Each cell of our body is using energy and creates energy; Just of different kind. We are little reactors, litterly and Matrix is possible.
....knock knock...
Our stomach brakes up food into "stuff" our blood can transport into every cell of our body. Water is used to chill and increase that energy transportation.
When muscles are in use they demand energy and therefore both blood and water circles increase activity. Our cells are all flexible. Some more some less, but they stretch to help the energy get where it's needed.
Actually, your muscles refuse at some point so nothing breaks, an effect Bodybuilders kill by incorrect dosing of other substances leading into unwanted damage.
To have stamina, endurance and strength, we also need to train our blood and water circulation, our breathing and control of puls each important to keep the muscles fuelled as long as possible...
#jedi
