def v_relative(v, met):
    """Estimates the relative air speed which combines the average air speed of
    the space plus the relative air speed caused by the body movement. Vag is assumed to
    be 0 for metabolic rates equal and lower than 1 met and otherwise equal to
    Vag = 0.3 (M – 1) (m/s)

    Parameters
    ----------
    v : float
        air speed measured by the sensor, [m/s]
    met : float
        metabolic rate, [met]

    Returns
    -------
    vr  : float
        relative air speed, [m/s]
    """

    if met > 1:
        return round(v + 0.3 * (met - 1), 3)
    else:
        return v