A trip to my local physio the other day confirmed what I had suspected - plantar fasciitis. One way or another it's not been a good few years for moving towards ultra distances - the last time I did anything over marathon distance was last June :-(
Once you convert to barefoot/minimal, you can develop an interest in biomechanics. That leads you to try and fix all sorts of things that had been hanging around for years not causing a problem. Maybe they'd have caused problems later, maybe not.
In my case, getting blisters with new shoes led to the discovery that my shoes were the wrong size, and for years I'd been striking with the outside of my left foot - little toe curled under. Fixing that led to tendon trouble in my left foot as it got used to the new gait. Once that was working, favouring my left foot led to plantar fasciitis in my right foot.
On the plus side I identified it early and have been treating it appropriately. Plus, the stretching of my soleus to fix the plantar fasciitis is having huge benefits for my ability to sit comfortably in full squat, something I've aspired to do for many years (it's a caveman thing :-))
So, a few weeks yet of 40km a week, lots of stretching and foot massage, then hopefully I can start to building the distances back up.
