No oomph

It was Sunday 7am and a great morning for a run, a cool crisp morning with blue skies and not a cloud in sight ...... perfect.

However, I got to about mile 4 and died, no oomph. I looked at my stop watch and was shocked by the slow time. I struggled for another couple of steps and then stopped. It was a beautiful clear quiet morning but I couldn't run another step, I can't explain really, but today I had no oomph.

I have 40 days left until my marathon.