u/shartytothefarty

I just turned 30 this year and my lifestyle is neither inactive nor active, I move around but also sit a lot and recently starting picking up pickleball with friends. Suddenly I’m playing 3 times a week the past 3 weeks and my knees started to hurt. Coach tells me I need to do strength training but why do I see players older than me play 6 times a week no issue?

EDIT: I think what I mean to ask is, can I get into pickleball expecting my muscles & joints to get stronger overtime, or does the strength need to come separately from strength training?