sentence: There are about ten or more people dressed in athletic wear doing a synchronized form of exercise. sentence:  They are doing the steps rhythmically to the beats of a song that is played in the fitness center. sentence:  There are disco lights flashing in the fitness center. sentence:  They continue to do the steps as they clap their hands in between the steps. sentence:  They also step on and step off of a step stool as they continue their steps.