an hei gwai yuen (shen qi gui yuan, kidney breathing returns to source) were passed down to grandmaster Sum Nung by Cheung Bo's teacher, Wai Yuk-Sang, who late in life converted to Taoism. The exercises consist of a sequence of hei gung- (qigong, breathing work) like movements. They are typically practiced both before and after training to reenergize and revitalize the body, and to make sure healing prefaces and follows martial activity. The kidney breathing sets include exercises like yielding breath, side-to-side waist, single hoof, expanding chest, and dropping power, among others.

Georgia practices the single hoof exercise.

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• Wing Chun Qigong