1. Sit-ups: Sit-ups are a common way to exercise abdominal muscles. You can spread a yoga mat on the floor, then lie on it, put your hands by your ears, bend your feet, and then slowly lift your upper body until your elbows touch your knees.
2. Lift the leg and lift the leg: This action can exercise the lower part of the rectus abdominis. The specific method is to lie on your back, put your hands on your sides, and then lift your legs up until they are perpendicular to the ground.