A marathon is not just a simple run. It is an extreme sport that challenges both the body and mind. To succeed in long-distance running, preparation beyond mere physical movement is required. This article discusses advanced training strategies for runners with experience to achieve better performance in marathons. First, the most basic aspect of marathon preparation is the frequency and intensity of training. Ideally, running at least 40km per week over 5 days is recommended. This helps the body develop the endurance needed for long-distance running. Additionally, improving speed and cardiovascular capacity through interval training is important. In fact, a 2019 study found that interval training can improve the average speed of long-distance runners by more than 5%. Second, nutrition intake is an indispensable factor. A proper balance of carbohydrates and proteins is essential for increasing endurance. Foods like oatmeal, bananas, and peanut butter provide sustained energy. According to a study by the Mayo Clinic, consuming sufficient carbohydrates before a marathon can increase muscle glycogen storage by up to 55%. Third, mental preparation is also crucial. Since a marathon requires endurance over a long period, boosting confidence and reducing negative thoughts through meditation or visualization training can be helpful. Harvard University research suggests that meditation is highly effective in enhancing positive thinking and concentration. To successfully complete a marathon, all these elements must be balanced. By systematically managing your training and diet records through the 'Daily Certification' app, and sharing experiences with various marathoners, you can receive continuous motivation. Such thorough preparation will be rewarded with a sense of fulfillment when crossing the finish line.