In my brother's opinion, sit-ups are never the best exercise to practice abdominal muscles. Abdominal muscles are also eaten, so don't ignore the importance of diet. Your abdominal muscles, like other muscles, need nutrients to support their development, but you must avoid fat accumulation in your abdomen. Systematic training plays an important role in the development of abdominal muscles. Don't focus on abdominal muscle training foolishly. Keep your abdominal muscles tense and don't relax for a moment; Maintain a state that is not completely locked and completely relaxed; Try to make the target abdominal muscles long enough and then contract.