The Rumba evolved in 19th century Havana, originating with the African Negro slaves who had been imported. The rural Rumba was originally for exhibition rather than participation. In some reference works the Rumba is said to be a pantomime of the movements of barnyard animals with the steady level shoulders depicting the movements of slaves as they carried heavy burdens. 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. Most ballroom dresses come in a variety of colors and there are usually no limitations in this aspect. It is common American protocol for women to match their partner when it comes to choosing the color of their ballroom dress. 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. To date the ISDF has been granted full recognition by the International Olympic Committee as the worldwide governing body for DanceSport and the USABDA has been granted affiliate membership recognizing them as the national governing Body of DanceSport in the Untied States. The last remaining step is for DanceSport to be granted Program Status by the IOC at which time DanceSport would then be added to the Olympic program. The Batuque was an incredibly popular dance - so much so that at one time it was outlawed. The Batuque was done in a circle with dance steps resembling those of a Charleston with a solo dancer in the center of the circle. Down the line carnival steps were added and members of Rio's high society decided that once the dance had been modified to use the closed ballroom position it was then a proper dance. Depending upon the style of dance, you can easily burn between 200 and 400 calories. For example, the foxtrot or the waltz provide an easy and gentle workout and will burn around 200 calories. This is comparable to a brisk walk in the park or thirty minutes on the elliptical. On the other hand, dances like the jive or paso doble can burn over 400 calories, which is comparable to an intense step aerobics class.