The Jillian Michaels 30-Day Shred workout plan, which was released in 2008, burns approximately 175 to 275 calories per session. This workout plan, which is considered a form of high-intensity interval training, consists of a daily 20-minute workout with three different levels of intensity.
The Jillian Michaels 30-Day Shred combines repeated intervals that include three minutes of cardio, two minutes of strength training and one minute of abdominal and toning exercises, with warm-up and cool-down movements. The exact number of calories burned depends on several factors including age, weight, dietary intake, gender and activity level. As of 2014, studies reveal that doing high-intensity interval training can burn more calories per minute than a low-intensity workout such as walking or swimming.