Ex-competitive runner here and for the longest time I felt I couldn't run. What I did was get the idea out of my mind that I had to be fast or do great distance! I also got orthotics and got shoes that worked for me, just not what was cheap or cute.

I've been running on the days I don't have time to ride. I'm also doing the tri (sprint) so while a lot of that will be walking, I can run some.

I walk a LOT too. Orthotics pretty much save me there too. Hiking is good