Exercising in cold weather could make you look decades younger. Take it from 50-year-old Liu Yelin who put her toned body on display as she hit a lake in the Chinese city of Xinyang on Tuesday. Liu Yelin has been billed by as the world's 'most youthful' 50-year-old after she shot to fame last year by posting pictures of herself through her Weibo account on Chinese social media. Liu Yelin keeps... Еще fit by swimming out in the lake every day, rain or shine, and she’s done it for more than 30 years. «In winter in Russia I think I can definitely swim for at least 5 minutes without any problems. So I hope Vladimir Putin will accept my challenge. He’s also a young looking fitness idol,» Liu Yelin said speaking of her hopes to compete with the Russian President one day. Liu Yelin says it is the sub-zero sessions that have made the difference. According to her 23-year-old son, people often assume his mother is his sister. The fitness fanatic has recently shared pictures showing her in a bikini on Russian Lake Baikal in extremely cold weather.