Our expert says:
Difficult to say - it is pretty common, and it's mostly because the muscles that control that knee are now tired from being "taxed" when you run. The fact that you don't have pain when running is an encouraging sign. This is something that will hopefully go away as you get fitter and overcome the initial aches and pains of running (which are very common). You have to be careful about how much you do, and also it's really helpful to stretch your quads in particular, and do some strength work for your quads - some squats and lunges, even if it's just once or twice a week, to help strengthen the muscles.
I'd try that, and see how it goes. If the pain worsens, go back in order to go forward - back two weeks in your training, that is. Then build up again.
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