You must have built up an awesome capacity. I think people who are strong and athletic like you must be, fall so easily into that one.

Read Mark's article I think it is "Chronic Cardio" about some downsides when you bust your ass every day.

In a funny way, the lack of progress might match the lack of slow and easy in your program. We always have to have a cycle of 3: working hard, compensating for whatever "came along for the ride" of the hard work, and easy moving.