After lowering my HM pb by about four and a half minutes last year I had (wrongly) been giving credit to, an extra run a week, cross training and a flat course when infact, I should have been giving the kudos to the 'shoe effecct'
Why is it that flying insects always make a beeline for your mouth when you are out runnning. I've lost track of the number of times I've swallowed a large bluebottle type fly and then spent 5 minutes standing by the side of the road retching. Last month one even flew into my ear. It was a bugger to dislodge and all I could hear was a constant buzzing.