1. Sit-ups: This is a good way to exercise abdominal muscles and waist muscles. You can do it on the ground or using fitness equipment.

2. Push-ups: This kind of exercise can exercise your chest, shoulders and arms, and also help you exercise your waist muscles.

3. Side plate support: This exercise can exercise your abdominal, waist and back muscles. You can do it on the floor or using fitness equipment.

4. Reverse belly roll: This kind of exercise can exercise your abdominal muscles and waist muscles. You can do it on the ground or using fitness equipment.

5. Sit and lift your legs: This kind of exercise can exercise your abdominal, waist and leg muscles. You can sit in a chair, put your hands on both sides of the chair, then lift one leg, hold it for a few seconds, and then put it down. Repeat this action, and then change the other leg.