Hou Zhenshan, 84, is a retired worker in Zhangjiakou city, north China's Hebei province. He started to practice yoga for body building 30 years ago, and his ailment gradually disappeared as the skills improved.
Now Hou can perform all the difficult postures; he even created some new postures. As the volunteer of the community, he often encourages others to practice yoga and advocates national fitness.
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