FOB classes are a mix of medium intensity variables for toning and balance; and ballet inspired high intensity intervals. FOB classes end with a full dancers stretch to increase flexibility and impact strength over time. FOB average calorie BURN: 500-700 per hour. Yes. Please. FOB is accessible to every fitness level, from novice to advanced, because each exercise is thoughtfully curated with options for all. Instructors are trained in ballet and fitness knowledge to help protect participant’s bodies in challenging ballet positions.