I was just about to go out and get both of these as was experiencing terrible joint pain in the knees, and quite persistantly. But was also in the process of switching my road training from jogging and sprints on a paved road...to strictly tabata sprints that I now still do on a grass and earthy path.
Been fine ever since.
In fact, I went and jogged one day just for the hell of it and knees started hurting immediately.
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