... and I am COMPLETELY freaked out about it. I spent a couple of weeks beating the bushes for advice about training. In my case, my legs were super strong, but my heart worked so inefficiently that I couldn't use them. And I'm training for a 9 hour mountain bike race? What was I thinking.
So after getting a lot of advice to do V02 Max intervals, and conflicting advice from a couple of friends saying that I should do long steady distance rides, and Googling all over the place trying to find some troubleshooting advice ... I finally stumbled upon a coach who was able to give me some advice.
So now a shameless plug for Trek's Women Who Ride Club: