The elusive 6 pack. The advice here really depends on your body and metabolism. Some can achieve 7-8% body fat easily, others never at all. Diet is the biggest thing. Most everybody eats too much. Cut out all refined sugars and keep carbs at no more than 100 daily. I've noticed good results from high intensity circuit training. Keep your heart rate up for 40+ minutes and you'll see results. Good exercises to mix up there are ladder sprints, box jumps, burpees, and rowing.