No Tomorrow is a fast-moving, sweat-inducing HIIT workout that's designed to test your VO2 max and your muscles' recovery time. It's time-based which means that the number of reps count. Try and keep the same number of reps (or better) for each exercise throughout each set. Stay on the balls of your feet when performing Jumping Jacks and bring your knees waist height when performing High Knees. Add EC if it still feels easy to you.
Extra Credit: 1 minute rest between sets.