I think exercising the mind is the hardest thing to do because it's so easy to take the path of least resistance.

What are your thoughts on the (1) Marathon Monks of Japan and (2) the Lung-Gom-Pa's (near mythical if not mystical) of Tibet?

(1) http://www.millennium-tv.com/Monks.htm (2) http://www.planetultramarathon.com/lunggomparunners.htm