That's similar to the workout program outlined in the book Body By Science. They advocate short high intensity workouts over long low to mid intensity workouts; the reasoning being this: with high intensity exercise you fatigue all three muscle groups (Slow, Mid, and Fast twitch) rather than just the first two in low intensity exercise.
This style of exercising forces the body to have a much more acute adaptive response than the typical low intensity exercise.
This style of exercising forces the body to have a much more acute adaptive response than the typical low intensity exercise.