It's simple. No matter how many sit-ups you can do at a time, do it slowly, 3-5 more than the day before. After two months, you should be able to achieve 200, and then you don't have to add any more. Time is too short to pay more. After every exercise, you should fully relax your abdominal muscles, pull them with your hands and massage them for a long time, otherwise you will feel uncomfortable the next day, and if you don't relax, you will have great side effects, no obvious effect and no elasticity.
In terms of recipes, remember to give priority to breakfast every day and eat more meat, eggs and seafood. Dinner is mainly vegetables. If you exercise more, you will definitely have a good appetite. I have never gained weight after eating a catty before.