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by Fricken 2630 days ago
Going back to when I was a teen I've never been able to keep up a running habit on pavement for more than a week before my knees hurt too much to keep going, but I've never had a problem running on trails and broken ground.

I did parkour for years, and at my peak I could jump from 12 feet up to pavement, everyone told me I was going to wreck my knees, it never happened. at 42 my knees are great but for the fact that I can't run regularly on pavement, and never could.