For a high-burn workout that takes you into the sweatzone from the very first set there is Blackbird. Make sure during High Knees you bring your knees to waist height and you synchronize your arms with your legs as you pump them back and forth and, of course, you only land on the balls of your feet. Add EC and you have the kind of workout that truly tests your VO2 Max performance.
Extra Credit: 1 minute rest between sets.
