1) Do crunches. Lie on the floor (with or without a mat) with your arms in front of your chest or with your hands lightly touching your temples (never behind your head). Bend your knees. Raise your shoulders (upper torso) towards your knees, using strictly your abdominal muscles. It is very important to not lift your entire back off the floor, as this can cause back strain, and the extended movement does not help you develop six pack abs any faster. The most important part of the crunch is the initial flexing of your abs as you lift your shoulders off the floor. As soon as you begin lifting off the floor exhale through your mouth, ending with a gasp once your shoulders are off the floor. Then pause for a second once you are at the top of the crunch and exhale the last bit of air from your diaphragm while flexing your abs. Now lower back down slowly and controlled while inhaling through your nose, just until your shoulder blades touch the ground. Do not let your head touch the ground.
2) Do sit ups. Lie on the floor, feet on the floor, knees up and hands crossed on your chest. Have someone hold your feet down, or wedge them underneath something heavy. Sit all the way up, lifting your lower back off the floor along with your shoulder blades. Keep your back straight (no hunching). Lower yourself down. Repeat. Once this becomes relatively easy for you (i.e. you can do a quite a bit with ease) start adding more challenges. Find an incline bench. Do weighted sit ups. Hold a weight on your chest while you do these. As these become easier, hold heavier and heavier weights.
