What are your goals? If you are trying to reduce the fat in your areas, you can stop putting the strain on your body... because spot reduction doesn't work. Individual exercises do not reduce fat in specific parts of your body, because your muscles draw their energy from the bloodstream, not the surrounding fat stores.
If you're looking for just a stronger core (which will help with posture and other exercises), there's a crunchless core video in the fitness section here on Sparkpeople.
Given your hernia, you may want to consult a physical therapist to help you design a safe program for you that will accomplish your core-strengthening goals without putting you at risk for further injury. DO NOT do situps... they put a lot of unnecessary strain on the back, and are pretty lousy as far as core exercises go. :)