Hi, I have a question about my abs. I haven't worked out in about a year. I am naturally thin and have a pretty flat stomach. I decided to start working out again on a regular basis of 3 times a week. The first day I worked out, I worked on my abs by doing various situps and crunches. By the next day my abs had swollen and ballooned out and it looked like I had a little pot belly. I have heard before that your stomach can swell like that after doing situps. I am wondering if I am doing something wrong, or if this will go away after awhile of getting back into working out and my stomach will just stay flat? It actually turned me away from working on my abs again because I didn't want to have a big stomach for a few days afterwards because of it, when my stomach is naturally flat on its own. What should I be doing or not doing differently? Whats the deal here?