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There are many styles of Thai Chi-Yang, Chen and Wu to name but a few. But the principles remain the same. The series of slow, flowing movements are said to improve blood circulation as well as stretching and toning muscles. The news for those addicted to the tan they get from a solarium, or Tanning bed, is not good. Solariums are one of the top skin-cancer causing agents, as they employ high levels of UV rays to create the highly sought after tan favored by frequent users. The first Treadmills were used by doctors in the 1950's, primarily to assess humans for heart and lung conditions. These days, however, the humble treadmill has made its way into our homes and is a great way to keep fit.