What yoga stretches will help with Knee and back pain?

I’ve been having a lot of problems with pain in back (especially across my neck and shoulders) and in my legs (knees especially). I think some of these aches are work related (I’m on my feet all day at work) but I also think they are due in part to depression. I’m already on an antidepressant and heard that yoga is great to help one relax. What are some good yoga poses that will help with this? I’m tired of being sore all the time.

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