Inferno HR is a revolutionary four-week workout program that uses the latest in heart rate monitor technology to make your workouts more interactive, effective, and trackable. The program is designed to ensure you get the most out of every minute of your workout. You’ll know when to push harder and when to slow down; when to max out and when to strive for endurance. You’ll also be able to get more accurate estimates of the calories you’ve burned. With personalized workout cues, you’ll never be left wondering how to do these workouts.