Any recommendations from all of you super fit people?

Hello! I decided to wander over to this forum for my question. I had my third baby last October. He was my largest baby by far and my lower back really took a beating(well worth it!). I'd like some recommendations on lower back exercises. I've tried planks and my back does feel better for a very short time. The pain is sharp and occurs at different times, with different movements. It's not always the same. Thanks in advance!

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