I agree with tri girl 100%.. there is nothing out there even on the web and PT's and even surgeons have little understanding. It's very misleading! Physios have the best knowledge but you need to find a good one. Perhaps we should get together, Trigirl, and write an international best seller! ;-)
There are better exercises than 'sit ups' and I try to avoid them. BUT you do need to some core stability work - that is different from crunches or sit ups and involves strengthening the deep transverse abdominals (TVA). Also exercises for your glutes, low back, hip flexors and shoulder girdle. There are exercises where you lie on your back, knees bent and suck in your deep abdominal muscles - pulling navel to spine - whilst relaxing the surface muscles. Hold for 5 seconds then release - repeat 5-10 times. You can then develop that to lifting a heel etc. But it's ideal if your PT or physio can supervise to check you're doing it right. Try not to be too worried about
causing a hernia though - you're more likely to get one if your core and TVA is weak.
If you email me I can send you a sheet of exercises I've been doing which might help...
[email protected]Sarah