Part dance , part aerobics , Zumba is an hourlong routine that works almost every muscle in the body . Set to original - style music , the routines include dancing and singing . Since 2003 , more than 20,000 people have been trained worldwide . Zumba adherents rave about its physical and psychological benefits .
Set to original - style music , the routines include dancing and singing . Since 2003 , more than 20,000 people have been trained worldwide . Zumba adherents rave about its physical and psychological benefits .