Although they probably all had some influence on the modern Waltz, at some point the Landler's hopping movement became more of a gliding motion, which is why the Landler more than the others, is sometimes considered the forerunner of the modern Waltz. In the early 19th century the popularity of the Waltzen rose to such a great degree that several large dance halls were opened to accommodate the crowds. A popular look for the top of the dress is either halter-style or sleeves that dangle from the shoulder. Strapless-style dresses are not very common in ballroom dancing, probably because of the risk of falling off during a fast-paced dance or not fitting properly while moving about on the dance floor. Another explanation for the stance and movements of the dance is that the Argentinean cowboys (Gauchos) would show up at night clubs without the benefit of a shower so when a lady agreed to a dance she would dance in the crook of his right arm keeping her head back. The knees bent stance of the dance was basically the way the Gauchos naturally walked as a result of wearing chaps that get soaked from the sweat of their horses then harden as they dry. Deaf and hearing-impaired dance students work had to remain "in time" with or without music. The most important things for teaching these students to dance are a visual count, high quality sound systems and use of sign language. Hundreds of viewers watched fascinated as Heather Mills competed for several weeks on Dancing with the Stars with one prosthetic leg. It has become a popular worldwide pastime, thanks to the media bringing it back into the spotlight with shows like "Dancing with the Stars." It wasn't long after the first season that the dance craze soon swept over America, with more and more people choosing to learn to dance. However, ballroom dancing is certainly nothing new and has quite an extensive background. Slaves imported into Portugal in the 16th century brought along their dances (a few of which are the Catarete, Embolada and the Batuque). Europeans thought these dances were quite sinful as the dancers were close enough to have their navels touching. The Batuque was an incredibly popular dance - so much so that at one time it was outlawed.