Was there a period, say, for a month or two , when you didn't do this power walk, and you noticed that you felt a tad bit better?
Good question. No. This is why I continue to power walk. I don't get worse from it. I don't feel it's causing any type of mito damage but you never know for sure. I've been doing this for a few years now but feel this is definitely my limit. I can no longer increase it.