Dan,

Thanks, I'm pretty well set on MHR from cycling. I've been able to develop training regimens in cycling that produce steady increases in performance and fitness. I am a gadget, chart and #'s geek, so the analytical aspect of the measuring and recording approach usually works best for me.

As a beginning runner I'm trying to find a way to raise my base level of conditioning for running to the point where I can begin to structure my training similar to what I do on the bike and accomplish my goals.

Are fartleks the right tool or should I be considering something else at this stage?

What condition should I use to determine that it's time to begin a recovery interval?