Easy-on-the-knees workouts

My knees have felt wonky for the past few days. Today, I felt only a slight tinge of pain for a brief moment during my afternoon workout. I quickly modified my moments and the pain stopped. (I probably should've stopped all together, shouldn't I?)

I don't think it's anything serious; I think it's just being 30-something and overweight. I want to keep exercising but I don't want to do any further damage.

Last year, I had (what I think was) bursitis in my right foot/ankle. I did chair workouts and took Aleve until it went away. I haven't had a problem since then.
So I'm wondering, what other routines can I do that are easy on the knees while I try to recover? Or should I stop working out until the feeling goes away?

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