Several colleges now offer ballroom dancing as a credit for physical education, and often they will invite the public to attend the classes. These classes are typically about one hour long, once or twice a week, and last for about four to five months. Although the cost depends on the particular institution, ballroom dance classes offered here are usually very inexpensive or free. 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. 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. Not only was it difficult to tell which leg it was most of the time but she performed some high difficulty moves that the other dancers didn't even attempt! However, there are several differences in ballroom dress styles depending on the country. American ballroom dresses are typically easy to distinguish from other nationalities. A primary trait of American dresses is that they "flow" much easier than those from other countries. For example, an American ballroom dress usually has at least two layers of skirt, along with other cuts of fabric flowing from the neck and back. Over the last 12 years USABDA has promoted the growth of all forms of ballroom dance as well as coming up with a program to establish chapters in each state. They have enjoyed major growth in numbers of chapters, dancers, competitions, workshops and social dances each year. Each year the USABDA sends United States representatives to the World Games. As fate would have it Rafael turns out to be a great dancer and becomes his father's best hope of winning a championship for his studio. The thing that makes this movie truly unique is that it is one of only a few movies that actually used ballroom competitors making for wonderfully realistic ballroom dance scenes.