It's funny. Since my heart attack back before Thanksgiving I've consciously thrown TRAINING out the window. I've just been riding by feel, and doing my riding as much as a social thing as anything.
My VO2 Max took a hit in the aftermath of the heart attack, but now it's back above what it had been and my FTP has crept up past what it was before the event, too.
This is with nothing more than the mountain bike class I teach once a week and the weekend rides I've been getting in.
I'm planning on resuming structured workouts at some point, but for this year I've just canned all my racing plans in favor of rediscovering the joy in it, and that has been extremely rewarding.