Dancing soon became a growing trend in several countries, and other styles of ballroom dancing were formed based on the various cultures. For example, the paso doble was developed in Spain in the 1700's to demonstrate bullfighter's agility and strength. In Italy, the mambo became a popular dance at weddings and special events, while the quickstep became the trend in America after World War I. Wheelchair dancing had been practiced in parts of the world since the 1970's but wasn't started in Malta until 1999. The group holds classes to teach dance to disabled people using a format very similar to that used to teach non-disabled people. The classes are open to people who just want to learn to dance and those who want to dance competitively. For other movies the ballroom dancing is the basis of the story as in Shall We Dance, a Richard Gere, Jennifer Lopez film about a family man who signs up for ballroom dance lessons in the hope of meeting the beautiful woman he has seen through the window of the dance studio on his commute home each night. The evolution of the Quick Step ended with a dance that utilizes a lot of movement, hops, runs, Quick Steps and rotation. It is a very brisk, energetic dance that was developed with very fast paced jazz music from the ragtime era. The Quick Step is a fast, happy, lighthearted dance, the footwork can be a little complex using a slow, quick, quick, slow, quick, quick tempo. These songs have a cheery and upbeat tempo and have a 1940's dance club appeal. The foxtrot is one of the most popular ballroom dances, although it is also one of the most difficult to learn. The foxtrot is a very smooth dance with fluid movements, and the movements are "slow, quick, quick, slow". 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. While walking on a treadmill or doing crunches are well-known exercises, they only work certain parts of your body - which leave you to workout longer in order to cover the rest.