I am not a runner and never have been but it might make sense about the knee thing sometimes walking down hills the knees seem that they can be a little more unstable because the foot has farther vertical distance to hit the ground each step.
Watching would surely be my choice I know that.
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Watching/ supporting is the wise thing to do when it comes to the Comrades yet the runners get hooked, I can understand it seeing the camaraderie amongst them, quite a challenge. The winners get rewarded very well too!