Answer:
The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life.
Your body will only be able to function and maintain it's homeostasis at a constant stable temperature of 98 degree's farenheit. It will usually only be able to take a min of 96 or a max of 102. Usually at hitting those max/min, the body will have begun to loose it's ability to mantain that temperature and it could then start beginning a downward spiral of Hypo- and hyper- Thermia, which is very dangerous.
Yes it is a sport, it burns calories, there are also competitions