How exercise can help with the healing of depression

I want you to incorporate some of the information I have aswell so that the paper does not look completely different. I do not have an exact thesis statement or direction on where i want to go with this paper but i do know that i want it to be about how exercise or physical activity can be benefitial to depressed people or how it can heal depression. I will upload the work i currently have and the instuctors instuction along with an example of a completed paper. If you have any questions please let me know. Thank you.