Veronica - that makes sense but with me, it seems like everything is lower body workout I know I need to work on my core and upper body a LOT more. Do you differentiate, then, between a fast flat ride and a hilly ride? Or is it all in what gear you ride in?

Hannah - what of their writings would you recommend? I looked at both websites and there are books but I wasn't sure what would pertain to me. Should I order something? Or are there writings on the web I should look for?

I can see how complex this all is! For example, I know you can burn fat differently (I think?) depending on what level you are doing. I also know that by keeping an activity at a certain level, you can go longer. I also read that by watching it during recovery rides/runs you can recover better because it's common to step up the riding/running because you're used to going faster. Piecing it all together, however, is making my head hurt!!!