One of the websites I visited said that the best ab machine ... is a fitness ball.
This book I borrowed from the library, Six Weeks to Sleeveless and Sexy by JJ Virgin has this guide.
YOUR HEIGHT AND BALL SIZE
4'11'' to 5'3'' : 55 cm (about 21 inches) inflated
5'4" to 5'10" : 65 cm (about 25 inches) inflated
5'11" or taller : 75 cm (about 29 inches) inflated
When seated on the ball with your feet flat, your hips and knees should be at or slightly above a 90 degree angle.
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