5. The Program II – Many people that I talk to want to become leaner. The latest information on this comes from a gentleman named Alwyn Cosgrove. (pronounced All – in) He talks of an effect called the “afterburn” where the body’s metabolic rate stays elevated for up to 38 hours after the proper type of workout. You may burn more calories during a pure aerobic workout. With an “afterburn” workout you end up burning more calories in the long run and it increases your body’s metabolism. With aerobic work your body adapts and becomes more efficient so you eventually need to do more aerobic work to burn the same amount of calories.