The Iron Scriptures

And the disciples asked Brodin, "Must we walk the path of cardio, for we fear the wrath of Cardio-Cthulhu who steals our sacred gains?" And Brodin replied with wisdom, "Verily I say unto you, moderate cardio strengthens the temple of thy heart without sacrifice to thy muscle; it is only in excess that thy gains shall perish." For as the river must flow beside the mountain without eroding it, so must cardio complement thy lifting without diminishing thy hard-earned swole.