Similar experience here. I put in about 40 miles a week at the gym all winter long, half of it in intervals, but still had catching up to do when I got back out on the roads. But I take comfort in figuring that I would have been that much worse off if I hadn't put in the time on the trainer. (Gotta find a silver lining in there somewhere, right? )

Looking back, I wish I had devoted more time to building core strength.