Embark on a heart-pumping cardio gym routine with this comprehensive checklist. Begin by warming up and stretching to prepare your body for the workout ahead. Select your preferred cardio machine and set it to a moderate intensity level for a steady-state cardio session. Spice up your routine by incorporating interval training, and don't forget to cool down afterwards. Keep track of your progress, stay hydrated, and maintain gym etiquette by wiping down the equipment after use.