def METHOD_NAME(self, name):
    """
    Create an activity.
    :param name: The name of the activity to create.
    :return: The Amazon Resource Name (ARN) of the newly created activity.
    """
    try:
        response = self.stepfunctions_client.create_activity(
            name=name)
    except ClientError as err:
        logger.error(
            "Couldn't create activity %s. Here's why: %s: %s", name,
            err.response['Error']['Code'], err.response['Error']['Message'])
        raise
    else:
        return response['activityArn']