Hmm...
I strengthened my abs using a pulley system.
The opposite exercise I used for my back was a hyper extension bench.
I didn't actually add any weight at all, I just did a lot of reps.
You've told me before you've done them haven't you?
On the floor you could raise the left-leg and right-arm together, then right-leg, left-arm. A few well performed reps of these work well.
This is just something I googled before, we all know the benefits of good posture for the back, but this sounds good;
Establish Core Support for Good Posture
And a related article gives some suprisingly common workout techniques.
Understanding and Enhancing Your Core Strength
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