I went through the 5K intermediate program at halhigdon.com -- which I think you recommended to me if I recall correctly. It was difficult but I was able to run 7 miles pretty comfortably at the end.
I hope I didn't discourage you. I've always had powerful legs. I think its long left over my my days as a sprinter (100m + 200m). I did lots of lifting for my legs back then (almost 20 years ago!).
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