Twenty years ago it was popular to train in the fat-burning zone. Instructors would tell their students to be sure they could talk in complete sentences while doing aerobic exercise to make sure they were primarily using fat as fuel. These fat-burning workouts would last a minimum of 30 minutes, while most would last an hour or more.
These days short, high-intensity workouts are all the rage, especially high-intensity interval training like you will see in our new CrossFire and To The Max videos. Research shows you burn more calories and body fat doing high-intensity interval training because of the after-burn effect.
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