Is there a safe-for-spine rep range for crunches/ sit-ups?

I have been regularly lifting weights for more than an year now, mainly with compound lifts. So far I have restricted directed ab work to planks once or twice a week as I read those are the safest for spine health. I recently joined a new MMA class where students do a lot of sit-ups. Is there a safe rep range for situps to maintain low back health? Thanks

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