import csv


def load_labels(filepath):
    """
    Loads and reads CSV MM-Fit CSV label file.
    :param filepath: File path to a MM-Fit CSV label file.
    :return: List of lists containing label data, (Start Frame, End Frame, Repetition Count, Activity) for each
    exercise set.
    """
    labels = []
    with open(filepath, 'r') as csv_file:
        reader = csv.reader(csv_file)
        for line in reader:
            labels.append([int(line[0]), int(line[1]), int(line[2]), line[3]])
    return labels