80 sit-ups, three months, but if there is fat in the abdomen, it takes more than 30 minutes to lose fat after exercise, so it takes 15 minutes to lose fat after 45 minutes of exercise. There is no need to train well for 60 minutes as long as possible. I suggest you try the latest abdominal slimming method: wave stretching abdominal slimming method, which is simple and efficient and can exercise while listening to music. I wish you success in slimming!