January 10, 2017 No Comments FREE Jazzercise Dance Fitness Classes for Girls Ages 16-21 Girls between the ages of 16 and 21 can take FREE Jazzercise Dance Fitness Classes throughout 2017 at participating GirlForce locations only. Locations. FREE Jazzercise Dance Fitness Classes for Girls Ages 16-21 Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.