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Anonymous
They covered this in a Kung Fu class I went to for a while.
Don't quote me on this, as it's only really a vague memory of what I was told.
Muscles work in pairs, one set to pull and one set to push (Very simplified version, stay with me). So when you do your crunches and your sit ups, you're putting 100% onto only half of the muscle system you want to train.
Long story short, do some lower back excersizes. The only reliable one I know is to lay on your front, then pull your arms and legs up off the ground, and tense your lower back. It was called 'The Skydiver' by my instructor.
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