This picture taken on January 17, 2013 shows 77-year-old retired teacher Gao Yinyu exercising in his underwear at a snow-covered bathing spot in Jilin, in northeastern China's Jilin province, in a temperature of minus 25 degrees Celsius. Gao has been exercising in only his underwear every morning for more than the past decade and has rarely caught cold ever since retirement. (Photo by AFP Photo)
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