I run on all sorts of surfaces and I tripped while overtaking a couple of walkers on a very bumpy, stoney country road. And gosh did I bleed. Elbow, arm, gammy knee and hand. I actually fell at the 30 minute point when Sam tells you to slow down and walk for 1 minute. But I got up, feeling rather undignified and ran off for another 30 minutes. Did I get some odd looks as I was very very dusty and blood from my hands was dripping down my legs. Mind you, nobody offered any help or anything! Anyway, I'll live.
On a different note only 7.5K in an hour. Disappointed. Better get cuts and grazes sorted. Bfn.