1. Sit-ups: Sit-ups are very effective exercises to exercise abdominal muscles. You can do this on the ground or on the fitness ball.
2. Flat support: Flat support is a very good core muscle exercise, which can help you slim your waist and abdomen.
3. Push-ups: Push-ups are very good exercise for pectoral muscles, triceps brachii and biceps brachii, and can also help you slim your waist and abdomen.
4. Running: Running is a very good aerobic exercise that can help you burn fat and lose weight.