Is there a link between physical and mental activity? For instance, when I'm feeling tired, often if I exercise, if I don't do it to strenuosly, afterwards I'll feel much more awake and alert. I would assume that since your heart gets pounding faster and your body sort of wakes up, that your brain would too. But then, assumptions have no reason to be right. So if you get your body moving, your heart pounding, does it stimulate your brain as well? If you're tired and need to do some sort of work (write a paper, solve problems), would jogging a mile before hand help wake you up and allow you to do it better?