Generally, abdominal muscles can be developed in three months of fitness. The exposure time of abdominal muscles through weight loss exercise is different with different body fat rate. Generally speaking, scientific anaerobic exercise and aerobic exercise are needed, and it takes more than three months to see obvious effects, while the exercise of reducing fat and increasing muscle needs to be carried out at the same time. At the same time, you need to control your diet. You can eat coarse grains and high protein food with fresh vegetables and fruits to develop a good routine. Don't stay up late at ordinary times and don't overwork, which is conducive to muscle growth and can be persisted for a long time.