Cardio Drill is fast, energetic and designed to test your VO2 Max capacity and open up your lungs. It's perfect for those days when you don't really want to have to think too hard about your exercise routine but still want it to push the envelope of your performance. Raise your knees to waist height when you perform High Knees and try to get it done with EC for that extra, performance-enhancing burn.
Extra Credit: 30 seconds rest between sets.
