Abdominal Muscle Development
To develop the abdominal region, you need to think of the 3 catalyst of abdominal development. Cardiovascular, abdominal muscle development, and nutrition. Of all three, you will be working with cardio training the most with nutrition second and abdominal muscle development last. My abdominal muscle training is about 30 minutes a week. My cardio training is about 4 to 5 hours a week. And nutrition is all the time it seems. You should divide your abdominal muscle training into two separate sessions. One session with reps from 12 to 15 reps. and the second session with reps around 20 to 25 reps. Other words, train the abs as any other muscle group. Be sure to work with a continuous tension flexing the abdominal muscles on top of the movement. Adding this to your training and you will find your abdominal muscles getting harder all the time. Quality reps instead of quality will produce the results you are after.