1. Foot touch method: lift the dumbbell with one hand and touch the instep of the same side with the other. During this process, the abdominal muscles contract, and this action is repeated in turn, every five times as a group. You can change hands to hold dumbbells and repeat the 10 group.
2. Sit-ups: Lie on your back on the ground, put your hands behind your head and bend your knees. Then slowly lift your upper body until your elbow touches your knee. During this process, the abdominal muscles contract, and this action is repeated in turn, every five times as a group.
3. Push-ups: Lie on the ground with your hands shoulder width. Then slowly lift your body until your arms are straight. In this process, the abdominal muscles will contract, and this action will be repeated in turn.