private void CreateExerciseInstance(DateTime date, string exerciseName, int set, int reps, float weight)
 {
     IExerciseInstanceService service = new ExerciseInstanceService(_exerciseInstanceRepository, _exerciseRepository);
     ExerciseInstance exerciseInstance = service.GetByDateTime(date);
     if (exerciseInstance == null)
     {
         exerciseInstance = new ExerciseInstance(date, new Exercise("", exerciseName), set, reps, weight);
         service.Create(exerciseInstance);
     }
 }