The reason why Saitama, the one-punch superman in the second season of Monster Superman, was so strong was because he had unique physical fitness and combat skills. Saitama was an ordinary high school student before he became One-Punch Superman, but he was fatally injured in an accident, so his body was transformed into a powerful warrior. Saitama has extremely strong strength and endurance, and can easily withstand high-intensity attacks and combat pressure. He also had a special perception ability that could accurately perceive the enemy's position and weaknesses and take corresponding countermeasures. Saitama also mastered a unique set of combat skills, including the most basic "Saitama-style Fist" and more advanced techniques such as "Infinite Expansion Fist","Light Speed Fist","Ultimate Flash" and so on. These skills could cause huge damage in a short period of time and quickly defeat the enemy. Saitama had also experienced many battles and training to continuously improve her combat strength and combat skills. His strong will and indomitable spirit were also one of the important reasons why he became a powerful warrior.