I've had a bad pain in my knees while doing a combo of walking & jogging...How can I get rid of it?

Not a relationship question but I've started to attempt jogging to try and get a bit fitter, I've been doing a combo of walking & jogging for a couple of weeks now; the last few days I've had pretty bad pain in my knees... Why?
And how can I get rid of it?
I've had a bad pain in my knees while doing a combo of walking & jogging...How can I get rid of it?
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