Check this out: http://en.wikipedia.org/wiki/Tendai_Marathon_Monks http://en.wikipedia.org/wiki/Tendai_Marathon_Monks [I read a book about them, _The Marathon

Check this out: http://en.wikipedia.org/wiki/Tendai_Marathon_Monks http://en.wikipedia.org/wiki/Tendai_Marathon_Monks [I read a book about them, _The Marathon Monks of Mount Hiei_, but it seems to be out of print and way expensive.]