My lower abdominals are too weak to do most lower abs exercises! What do I do to train them?

I am 5’8″, 145 lbs. My lower body is more developed muscle-wise than my upper body. I try to train them equally but my lower body training has definitely seen faster improvements than my upper body training. I try to incorporate abs into my workout, but my upper abs are more developed than my lower abs. Not only recently did I realize when I try to work my lower abs (lying leg raises for example) that I am improperly performing these movements, ie. radically arched lower back. I can’t seem to keep my lower back presed to the floor for most lower abdominal movements.

It is because my legs are just too big and my lower abs are just not strong enough. But how do I correct this? How can I develop my lower abdominals? What are some movements that I may be able to do?

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