pilates ab exercises are a good idea. instead of a full crunch, try doing a core curlup. The 100's mentioned above are also very effective. However, if during any ab exercise like this your lower back starts to hurt, that means you are not using yours abs enough.
Especially during Pilates 100's: If your lower back starts coming off the floor (which would cause strain and discomfort), really try to focus on using your abs to support your entire core and keep your back flat on the floor.
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