Wow, I was getting ready to get flamed! Thanks for the response. You're right, I never wear a hr monitor. Once or twice I have but I basically have always gone on perceived effort. I've been thinking about adding another day of running, mostly because I've been enjoying my running a bit more lately, but I was thinking that I should probably cut down the pace a bit. There is no question that when I have gone out and run a 9-minute mile (a couple of times with my wife), I feel like I could run 50 miles with no problem. I've been intrigued by some of the results I've seen by some other posters running at a pace so much slower than myself. I think that without question I would need to reduce my pace if I increased my mileage up to 70 or so miles a week otherwise I think I would get injured. Thanks again for the reply, I read you a lot on CR but was always close minded to the ideology of LHR training. At the very least, I would like to understand it further even if I don't choose to utilize it now. Thanks again.