Health retreats in Japan

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I am looking for health retreats in Japan. Specifically places that offer meditation (not necessarily zen), healthy food, a relaxing environment and beautiful scenery. I would like to stay somewhere in the mountainous area around Nagano, or perhaps around Kyoto.
Can anyone suggest resources to help me in this search?
(Mods: I would like to tag this question with 'retreat' but do not have the points to do so).
Best Answer
Wikivoyage has a couple of meditation retreats around Japan:
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Amanemu - Luxury Resort in Japan - Aman
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