Many women have flabby stomach after pregnancy and the best exercise program for that is 2 days of cardio routine and 3 days of abdominal exercises. Inculcate some full body weight training with exercises like squats, lunges, deadlifts, etc. to tighten the stomach in quick time. Some people are left with a flabby stomach after weight loss, especially if they lose weight quickly. The only way to get rid of this is with some abdominal exercises and high intensity cardiovascular routines.