I've searched and read all of the posts on Soleus issues (or, many of them.. there's a lot). I've had recurring issues over the years but past 2-3 years has not been bad. First to admit my calf strength is not that great and needs work. I do not recall seeing a situation where it goes from leg to leg and back

Did Santa Cruz half, no issues, but seemed to trigger some reaction. Calves felt a bit sore and overworked afterward, and when I started to run a week later, this issue started. About a 1/2 mile into some runs, soleus gets a bit tight, then downhill from there. Will be sore the rest of the day, but within 24-36 hours seems to resolve. Then maybe I can run again... or maybe not.

Here's the weird part for me. One day it will be the left. And then another day it's the right. Exact same spot, exact same symptoms and resolution.

I've seen my MAT guy who indicates a lack of core strength. I've been able to run between 1-2 hours without it being an issue since Santa Cruz. Then I go out and 1/2 mile in I feel the tightness start and pull the plug

Any experience with this ping ponging? or ideas as to cause?

Entered IM CA next weekend and wondering how much I'm going to have to walk (or, how much more than usual....).