Thanks everyone!

I'm glad to know that the spinning is more than strictly cardio. I thought I noticed a difference on the road but wasn't sure how beneficial it all was.

Cari, yeah, I do know what it's like to ride 100 or even 130 (my record in one day -- about killed me!). I also fully realize that legs are only part of the equation. The old adage "if you can ride 50, you can ride 100" is partially true but it's the saddle and wrists that'll hurt before legs if you aren't used to being on the bike 6-7 hours. Despite the fact I've done it before, I also noticed all my ride shirts appear to say 1999 on them.

I'm trying to do spin classes in bad weather or on days I work then I'm trying to do actual riding on my days off. It also seems like spin class is more difficult than, say, only having an hour on the bike and having it be on a flat surface. With limited time, I'm trying to make the most of my training.

And Jenn, you didn't drag on at all! I love hearing about experience