The most effective method of thin abdomen Step 1: Bend down and lie flat on the mat, and naturally put your hands at your sides. Lift your legs, your thighs are at 90 degrees to the horizon, and your calves are at 90 degrees to your thighs. Use the strength of the lower abdomen and thighs to lower the legs in turn and then hang them. Don't touch the ground when your legs are down. The downward hanging of one leg is 1 8 beat, with 8 8 beats each time. Step 2: Bend down with elbows down, put your hands on your chest, and support the ground with elbows and toes. Support your body with abdominal strength, hold 10 for 20 seconds and then put it down. Can be repeated many times. Family upright twist: upright, feet open slightly wider than shoulders. Put the clothesline on your shoulders with both hands and twist your upper limbs left and right. Pay attention to keep your hips still and concentrate on the strength of your waist.