Preparation is vital. A low-fat diet, a B-complex vitamin, probiotics. Cardiovascular training is most important for the rigors you will be facing, but stretching and weights can be beneficial as well. And because it's ultimately a mental and spiritual challenge, daily yoga and meditation.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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