Homeostasis, by definition is: a relatively stable state of equilibrium or a tendency toward such a state between the different but interdependent elements or groups of elements of an organism, population, or group. So when you do strenuous activities, such as running or sports, then you upset homeostasis, and you body does what it can to "adapt" to the situation. For instance, if you are running, you will overheat unless your body opens some sweat glands in order to cool your skin, and the inside of you body off. This is known as a negative feedback, because you are trying to reverse the process of your body heating. An example positive feedback is really anything that enhances your body, and as bad as it sounds, cancer is a positive feedback because of the growth hormones that it "injects" into your body. I know it sounds absolutely dreadful, but it is true. No, cancer still isn't technically a good thing...
We did a lab about homeostasis, only ours was more along the lines of who can return to homeostasis faster, after being "superheated" and "supercooled." We did only use our hand, but i think that it worked relatively the same. As you can see from this graph, it really does depend upon who you are. As you can see, Seth and Tim were both slower that Cassidy and Jenna on returning to homeostasis from hot water. Although for cold water Seth was extremely faster in returning to homeostasis that everyone else. Whereas Tim was extremely slow compared to others. The average out of these for people to return to normal in hot water was about 5 minutes. For cold water it was about 20 minutes. which tells us that it is easier to cool down than to warm up. Interesting expirement if i do say so myself. 