The pain of the 10k

I did a few 10k races during my time living in Peterborough. It seemed the obvious thing to do in a place so painfully flat. I stopped to concentrate on marathons. I now remember why. I’ve run four 10k races since September: Middlesex 10k, RunThrough Brixton 10k, Serpentine New Year’s Day 10k and, on Sunday,…