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The most important aspect of a person’s life is the “circulation of Qi and blood”. When the circulation of Qi and blood is vigorous and smooth, a person’s health will improve. Conversely, if a person’s Qi and blood are depleted, their health will deteriorate. For example, in one’s twenties and thirties, Qi and blood are at their peak, and physical condition is optimal. By the time one reaches their sixties and seventies, with Qi and blood exhausted, physical condition will decline significantly.