whats an exercise thats better than crunches for lower and upper abs?

whats an exercise thats better than crunches for lower and upper abs?
I can do 200 situps or 300 in sets of 40 like 40 then 40 but i cant really feel it like after the workout i cant feel the pain i use to feel like pain and it feels good but now i dont so please people do you know any new good workouts for abs and how many times should i do them everyday or every two days
thank you for reading….

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