RC03 – Optimum HIIT Cardio Training – 103 – Registration You must first complete RC03 – Optimum HIIT Cardio Training – 101 – Welcome before viewing this LessonPlease sign up for the course before starting the lesson. HIIT Cardio-103-Registration RC03 - Optimum HIIT Cardio Training - 101 - Welcome RC03 - Optimum HIIT Cardio Training - 102 - Course Structure Back to: RC03 – Optimum HIIT Cardio Training > HIIT Cardio 1