Its frustrating that often times the first place you gain weight is the last place it comes off. The key to getting a trim midsection is really diet- your ab work is done in the kitchen. If you eat a healthy balanced diet with LOTS of lean protein along with intense cardio (running is great for fat burning) you'll get great results. I agree that P90X is a great program and is definately something worth looking into. You should look at the fitness test on line, you never know what you're capable of until you try!
You should keep track of what you're eating every day. I use the "lose it" app for the iphone. I think they have a web based version as well. You can also track your macro nutrient ratios with "lose it" as well. For fat loss you want a ratio of 45% of your calories to come from carbs, 35% from protein and 20% from fat.
Make sure to drink LOTS of water.
Try to incorporate monounsaturated fats into your diet. Things like nuts, avocados, fish, dark chocolate, olives and olive oil. I found the "Flat Belly Diet Family" cookbook to be really helpful.
Good luck, stick with it and be patient. Your hard work will pay off! :wave: