Just ran the Brecon 10 miler ( on a hilly course ). I was going to use it as a training run but my heart rate was so high at the start and I was in good (female) company, that I just kept up the pace and finished in a very satisfying 1hr.32 minutes. Hoorah !!!
On the basis that I want to run a sub 4 hour marathon, how can I best train to keep the same pace for London next year