I posted a while ago about what I reckoned the benefits of trail running are: good for speed, and good for stability of the back. I feel comprehensively knackered when I've run on a trail in a way that I don't when I run on the road. Thanks to Stu, I've now discovered that the experts at the Guardian agree with me - trail running is good for you. I'm a running savant!
If you go to www.grauniad.co.uk, it redirects to the Guardian's website!