You could do a decent ultra, just walking!
Been watching race walking videos today, after that walk. Will try some 5Ks to see how it goes. Believe it or not, my hamstring is sore and that is a common race-walker injury. At least I know how to get injured :)
...and no knee pain? Weird.
Always knee soreness, and overall it is getting worse again. But has been nearly 6 months since my last injections.