It's just that the treadmill is slow, and anaerobic exercise should be added. It is not easy for girls to practice muscles. Don't worry too much. Doing more aerobic exercise is more difficult to build muscles.
First warm up for 5- 15 minutes, do anaerobic unarmed or equipment for 20-40 minutes, and finally jog or brisk walk or bike for 40 minutes. Relax after you finish. Abdominal muscles practice every day.
Whether aerobic or running, it takes more than 40 minutes to effectively lose fat, no more than two hours a day, five days a week.
Warm up before doing anything, and relax after doing it. At least five minutes. Practice the upper body first and then the lower body.
Avoid sweets, high-fat and high-calorie barbecue and frying, eat more fish, meat, eggs, beans, dairy products, fruits and vegetables, and get enough sleep is also important.
Thin belly, too, anaerobic abdominal exercises as shown in figure: