The wind inside the body may move from the bottom of the body upward, or from top to bottom, or from left to right, or from right to left—this is the dynamic nature of wind. When we sit in meditation, we can perceive it; as soon as the qi channels move, we can feel it. The qi channels are wind; wherever the qi channels go, that is where sensations in the body appear. Originally, when you sit, your body is slightly bent, but once the qi channels run to the back of the body, the back immediately straightens up. Without deliberately sitting upright, the body naturally straightens by itself—this is the dynamic nature of wind and its governing effect on the body.
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