In article <31cb08b0.681000@nnrp.crl.com>, Don Kirkman <donk@a.crl.com> wrote: >This is one of those little things that nag until they get some >attention. I have read and heard many bits of advice to run on asphalt >rather than concrete, since asphalt is softer. Sceptic that I am, I >wonder about this. if it's important, you ought to be able to feel a difference - for example, the difference between running on tarmac (asphalt) and earth is obvious, especially if you have a slight injury (when it can hurt on one surface, but not on the other). i've never noticed anything, and i'd be surprised if there is a ntoiceable difference, but i haven't tried it... andrew -- work phone/fax: 0131 668 8356, office: 0131 668 8357 institute for astronomy, royal observatory, blackford hill, edinburgh http://www.roe.ac.uk/ajcwww