Warming Up for Cardio
For cardio and aerobic exercise, you’ll have to do dynamic stretches for five to ten minutes. You should also incorporate movements that slowly increase your breathing and heart rate which will help your endurance throughout your actual work out.
Do some squats, calf raises, jumping jacks, and lunges prior to running, swimming, or hopping on a cardio machine. Then start your actual workout slowly yet steadily at first before switching into high gear. If you’ll be running, brisk walk for a few minutes first. If you’ll be going in a spin bike or treadmill, start with a lower cadence. If you’ll be swimming, start with a slow yet consistent stroke rate.
The goal for your cardio warm-up is to get your heart rate up at a steady pace so you won't get tired easily.