When I walk or run, both of my feet and right leg up to mid-thigh tingle and feel “crawly” and occasionally my hands tingle, too. Within 5 minutes of stopping, it goes away. It’s not to where I can’t exercise, but it does feel strange the entire time.
I’m on weekly b12 injections and the strange sensations have definitely improved since I started those, but exercise makes it very noticeable.