Body Heat Productions

body heat productions
What happens inside the body when we workout?

I recently started weight training, but i have no idea of what happens inside our body when we workout.
Pls explain me(or send a link that will explain me) what happens inside us when we workout.
I heard about heat production, cell buring, blood rush in veins, muscle tears, etc.
“Pls give me an overall (atleast brief) idea. ”
Sorry for my bad sentence formation,
thank you,
Sandeep

You tear your muscles. You break em down. Then they regrow larger. They break down which causes your pain after you work out.

^ Brief.

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