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Quay tr? l?i v? trí c? c?a b?n trong t? th? plank cao, sau ?ó l?p l?i ??ng tác ch?ng ??y.– Th?c Hello?n b?m m?: Bác s? s? d?ng b?m tiêm chuyên d?ng ?? c?y m? vào ng?c (c?y l??ng m? v?a ?? ?? t?ng dimensions ng?c sao cho cân ??i v?i vóc dáng t?ng ng??i).??c bi?t, v?i nh?ng tr??ng h?p ng?c b? sa tr? nh?ng không có nhi?u mô m? d?n ??n t