Hakuin Ekaku - Wikipedia, the free encyclopedia: "Zen sickness"
Hakuin's early extreme exertions affected his health, and at one point in his young life he fell ill for almost two years, experiencing what would now probably be classified as a nervous breakdown by Western medicine. He called it Zen sickness, and sought the advice of a Taoist cave dwelling hermit named Hakuyu, who prescribed a visualization and breathing practice which eventually relieved his symptoms. From this point on, Hakuin put a great deal of importance on physical strength and health in his Zen practice, and studying Hakuin-style Zen required a great deal of stamina. Hakuin often spoke of strengthening the body by concentrating the spirit, and followed this advice himself. Well into his seventies, he claimed to have more physical strength than he had at age thirty, being able to sit in zazen meditation or chant sutras for an entire day without fatigue. The practices Hakuin learned from Hakuyu are still passed down within the Rinzai school."
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