I don't... but the way my running... or lack of rather... has been lately, I am setting my eyes on speed/race walking as well.
Right now, I can pretty much walk a 15 minute mile... and maybe with some practice I can get it faster?
Of course my running coach says I will run... but things aren't improving... and the legs are still hurting... so... who knows.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"