How to train core?

My back is messed up. Nothing physically wrong with it besides. I'll get a sore back if I work on any ab "movements" or squats. So I'm at a lost how to strengthen my core. Even planks hurt my back. If I do enough. How can you safely strengthen your core with a sensitive back? I get L-sits might be fine for me. But then the flexibility is not amazing. And my arm strength is capable. But it's still alot. I'm looking for a way to directly target my abs. And to work them directly to get better at balancing and I think I understand that it will lessen the amount my back will be in an injured state.

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