If you persist every day, it will take about two months. You can do some abdominal rolling, supine leg lifting, flat support and other exercises every day. Generally, one group does 20, three groups a day for two months, and with a reasonable diet, the effect of abdominal muscles can be achieved. What needs to be paid attention to is the specialization of sports. Just do push-ups and sit-ups properly, just keep exercising, pay more attention to rest and avoid muscle strain. Don't be too hasty in abdominal muscle exercise, which may lead to muscle injury. The main methods of abdominal muscle exercise are sit-ups and parallel bars. If you still feel slow, you can go to a professional institution for training.