Interesting reading, thanks for posting.

When they talk about fat-burning, I'm not sure what duration they are talking about. I mean lets say you are in zone 2 with occasional bursts into zone 3...but for like 6-12 (or 24 for the endurance freaks..) hours. How can the body not burn fat? As anyone who has participated in endurance events knows, it's difficult to take in enough calories in that situation.

As someone else pointed out, I think the theory is geared toward sedentary people who only want to "work out" ~30 minutes per day.

I do agree that the shorter the workout; the harder the effort!

One thing that has always stymied me. I seem to be "backwards". I don't build "base" in the winter. I tend to do short, hard workouts when the weather is nasty (30-60 minute runs, 30-40 minutes on the trainer, 30 minute swims etc etc). I end up doing a lot intervals. I only get long, slow distance when the weather turns balmy and I really really *want* to be on the bike for 4+ hours.

Anyone else experience this paradox???