This post was SO helpful to me! I have been riding a road bike casually for the last few years and just now starting to get more serious about training and learning the mechanics of the bike. I have the free Spineravls CD that came with my trainer and was wondering what all the number were about (39x19). Wow, now it seems so obvious and I feel kind of stupid. Also, I've been looking for an interval training guide beyond the video so thank you for posting yours.



. Also, I've been looking for an interval training guide beyond the video so thank you for posting yours.
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