Can't Do a Sit Up

As you can tell by the title, I can't do a sit up. I can, if I use my arms to aid in pulling myself up once I reach my "stuck" point. If I continue this, will it help me eventually be able to do a sit up without using my arms? I am currently working on my plank time. What other exercises can I do to strengthen my back, abdominals, and hip flexors?

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