lower back problems make abdominal exercises hard for many people....they both rely on each other.
You can do some back bends for a while even with a little weight (I used a lot of weight doing these and I have never had a low back problem and can lift things 'incorrectly' and not worry about it so much, useful when you are on a boat and you can't always bend at the knees).
Once you back is strengthened and conditioned a bit, you can start crunches....do knees bend and hands at your ears or side (easier) but never behind your head or neck. For lower abs (where most need the conditioning), do leg raises (being on a platform/bench is best)...keep your shoulders up and hands sort of under your tailbone (takes stress off the low back).
Best Misquote ever.
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