You will get fitter, make some new friends, might get paid or rewarded and have the satisfaction of winning (if you do, of course, win).
A positive attitude toward life can be summed up in the idea that if you do your part, things will usually work out for the best.
you feel happier and refreshed if you are positive EVERYWHERE, not just work.
physical activity for health doesnt really differ from physical activity for fitness that much.. It is almost exactly the same. it really depends on what you consider as 'health' and what you...
of course, everything from adrenaline to confidence, improve one area and it improves another