code: public Observable<TrainingStatus> getTrainingStatusAsync(String personGroupId) {
          return getTrainingStatusWithServiceResponseAsync(personGroupId).map(new Func1<ServiceResponse<TrainingStatus>, TrainingStatus>() {
              @Override
              public TrainingStatus call(ServiceResponse<TrainingStatus> response) {
                  return response.body();
              }
          });
      }
docs: Retrieve the training status of a person group (completed or ongoing).
  
  @param personGroupId Id referencing a particular person group.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the TrainingStatus object