My absolute favorite exercise, believe it or not, is mountain biking - not running! If I could go mountain biking every day I would. I have choosen running because I am not that great of a mountain biker and there is no way I would even enter a mountain biking race - I am no where good enough. So I run and enter races when I can. Don't get me wrong I love running but I if I had a choice I would go for a 2 hour mountain bike ride over a run anyday.
What is your favorite exercise?