5. Focus on your diet, not on ab exercises. The best approach is to focus on your diet, then doing cardio exercise, then building muscle, and then doing ab exercises. You can lose 1-2 lbs. per week doing this. Prepare and eat meals for 60 min. each day. Spend 20 min. 3-5 times per week doing cardio. Do 15 min. per day 3 times per week of strength training. Then, do just 5 min. a day 3 times per week of ab exercises. It is that simple.