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I had a back problem for many years, and various gymheads and trainers told me not to work my lower back, but just work my abs and not worry about it. So I did, heavily for a long time. Didn't make my lower back any worse, though it didn't make it any better, either. So I don't think there's a potential problem for the abs overpowering the lower back muscles, or anything else.
In any case, that hanging leg lift you're doing sounds like it works the lower back at least in part. Most hanging leg lifts work the low back to a greater or lesser degree.
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