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Try cycling, it uses completely different set of leg muscles and its my goto when my knees start hurting.

The two sports also complements each other very well since the muscle groups support each other and cardiovascular side of things are the same.

Careful there. By combining running and cycling, you’re 2/3 of the way to triathlons. And why suck at 1 sport when you can suck at 3?

This is a question I've been asking myself, the future looks wet.

I mostly cycle. When I run it is usually on trails, and during winter. It is much easier on the knees than running on pavement.