If your body form prevents you from planking, then find an equivalent exercise or effort and do it for one minute. Be safe and know your limits. If you cannot reach one minute, try again next time.
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Zhuangzi (book) (Wikipedia)The Zhuangzi (Chinese: 莊子, historically romanized Chuang Tzŭ) is an ancient Chinese text from the late Warring States period (476–221 BC) containing stories and anecdotes that exemplify the carefree nature of the ideal Taoist sage. Named for its traditional author, “Master Zhuang” (Zhuangzi), the Zhuangzi is one of the two foundational texts of Taoism, along with the Tao Te Ching.