The Afterburn effect is as cool as it sounds.
The basic concept: Continue to burn Calories at a higher rate after your workout has ended.
The science: Excess Post-Exercise Oxygen Consumption represents the oxygen consumption above resting level that the body is utilizing to return itself to its pre-exercise state. "The physiological mechanisms responsible for this increased metabolism (all chemical reactions in the body to liberate energy that is measured by oxygen consumption) include the replenishment of oxygen stores, phosphagen (ATP-PC) resynthesis, lactate removal, and the increased ventilation, blood circulation and body temperature above pre-exercise levels (Borsheim and Bahr, 2003)".
How do you get there?
Inensity. Afterburn exists in every functional scenario. The duration of afterburn is what you are trying to affect. It can take the human body minutes or hours to return to resting state, depending on intensity.
How do you know if your workout is intense enough?
Unsustainable activity. Your workout should include intervals of unsustainable action. You can walk on a treadmill for hours, but you can only blast a sprint for a short time. Weight training in an excellent example of unsustainable activity.