Watcher's File #3

I see that many people are getting sick...Or at least weakening...I see that even in this weakened state they still push their bodies to their breaking point...This, in turn, weakens them more...These observations lead me to a few questions: a.) Why do people push themselves to do what they can't? b.) Is it just human nature to go against physical limitations? c.) Why is it that the Host has the opposite disease...Instead of pushing himself to his breaking point, he doesn't push himself at all?