The techno hippy line from the dot.com era was "information wants to be free." There's some truth in it. Nobody knows anything worth knowing that probably hasn't been researched and written about. Some of you would be surprised at what you can find at your public library. Or even online. You've to do your work and cross-reference your sources. But the data is there to be gotten. More to the point, I agree with the post-starter. I've always had good anaerobic cardio and lousy aerobic cardio and that's always held me back. I've finally (finally) gotten serious about improving my aerobic cardio this year. (I'm following a "couch to 5K" running program from Cool Running) It's hard work (at least for me), but there's no other way.