A 63-year-old yoga enthusiast named Lei Changgen arrived to teach a class at the Nanping Hongsheng Square in Nan’an district, Chongqing on the morning of September 30. Little did he know, he soon would be challenged by 80-year-old Wen Huazhong and his powerful “Iron arms”. Together, the two “grandpas” began showing off their crazy strength and putting on a show for passersby.