RUBalletFit - week 2 RUBalletFit workout requires controlled movements. Tightening the muscles in use as well as maintaining proper posture during ballet moves helps tone and strengthen muscles and improve posture and stature. This type of workout is great for individuals who simply want a workout that will help tone what is already there but are tired of the typical weight training workouts. RUBalletFit as Ballet is also the only workout that will help improve grace and improve fluidity in movements.