The ANIME, as always fudges details.
KEY:
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Intermittent fasting.
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Lower BP (bananas, melon, beets)
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Exposure to atmospheric pressure
"Sorrow" is what is being trained.
Sorrow increases (subjective) "gravity".
Train till everything is heavy.
Then continue on: heavier & heavier.
Eventually "anti-gravity" physiology kicks in.
Get it, Anon?