This isn't really a 'primal' question, per se, but I've recently cut down on my running in favour of walking. I usually run about 15 miles a week, but after learning about the benefits of interval training, I've decided to switch to sprints. Anyway, I've never had trouble with my knees when running, but now, when I go for a walk, my knees are just killing me! Have I forgotten how to walk properly?! Has this happened to anyone else?
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Walking and running