The following are some abdominal exercises that can be performed in bed: 1. Lie on your back and lift your legs: lie on the bed with your hands at your sides and your legs straight. Then slowly lift your legs until they form a 90-degree angle with your body, and then slowly put them down. Repeat 10- 15 times. 2. Lift your supine legs alternately: lie on the bed, put your hands on your sides and straighten your legs. Then slowly lift one leg until it forms a 90-degree angle with the body, then slowly put it down and lift the other leg. Repeat 10- 15 times. 3. Lie on your back with your legs crossed: Lie on the bed with your hands at your sides and your legs straight. Then slowly lift one leg, cross the other leg, slowly put it down, and then lift the other leg. Repeat 10- 15 times. 4. Sit on your back and lift your legs: lie on the bed, put your hands on your sides and straighten your legs. Then slowly lift your legs until they form a 90-degree angle with your body, then slowly lift your legs until they are perpendicular to the bed surface, and then slowly put them down. Repeat 10- 15 times. These exercises can help strengthen abdominal muscles and reduce abdominal fat, but it takes a long time to see the effect. At the same time, we also need to pay attention to the adjustment of diet and living habits, in order to achieve the effect of thin belly.