OW DOES EXERCISE MODIFY NORMAL PHYSIOLOGY?

Hi there
How are you?
I hope fine!
You will find in the attachment full explanation about the essay!
I will attach some journal articles and some pages of text book if you want to use them!
If you use other journals or text book, can you please send me a copy of it, and any stuff you used to write this essay!

Thanks in advanced

Best regards
Hamad