public FitnessClassDTOCollection GetFitnessClassesByInstructor(string instructorId)
        {
            FitnessClassCollection list = FitnessClassManager.GetCollection(instructorId.ToInt());

            return(this.FitnessClassCollectionToDTO(list));
        }
        public FitnessClassDTOCollection GetFitnessClasses()
        {
            FitnessClassCollection fitnessClassList = FitnessClassManager.GetCollection();

            return(this.FitnessClassCollectionToDTO(fitnessClassList));
        }