Take it easy with all the crunching and abdominal exercises.
Having clear cut abs is great. Most train their abdomen with intentions of showing them off the next time they are at the beach but direct abdominal training or isolating the abdomen while training is not best. We must also view the abdomen for what they actually are. Abdomen are only part of the core. Being only a part of the core they should rarely be trained in isolation. Or, I should say that training them in isolation is less functional for the body and can even become harmful. Exercises that train the muscles of the pelvis, lower back, hips and abdomen in conjuction are best. All these muscles must work in harmoney for peak performance. (Strength Conditioning Journal, 32 (5): 69-74, 2010)