The Promise The 60 second promise is simple: Work hard for 45 seconds, rest for 15 seconds and you'll lose more weight in less time than ever before. Personal trainers will tell you that interval training is the key to burning fat - getting your heart rate up while challenging key muscle groups. Now you can finally get all the benefits on one DVD - fast, effective, permanent weight loss and fitness. This is the fitness revolution that's changed the way we'll work out forever.