AS I'm now on the plan for the Cambridge half in March, I've started including weekend long runs, this weekend was 12km (1:05:xx). I've had the same issue this time as pervioulsy in that my right lower achilles and heel are very sore the next morning. No issues on the day or post run, but getting out of bed it was very sore this morning. Stretching it out with heel drops and standing stretches has released it to the extent that I'm walking normally and could manage a 60km ride this afternoon. As I sit here nowI can feel tightness under the heel and flexion of the foot gives pain in the achilles and soem foot tightness.
I'm wondering whether this is simply load-reaction tendonitis (I've had achilles issues in the past) or whether the overnight onset is suggesting a form of PF?
For completeness, no issues following rides of up to 110km, no issues following the shorter runs (tempo, intervals etc up to 8km)
Cheers
Dave