"Being Strong Is Fun" (強いは楽しい, Tsuyoi wa Tanoshī) is the 70th chapter of the One-Punch Man manga series.
Suiryu take the fight more seriously using strong kicks to push Saitama to the edge of the arena and kicking him in the air then back down and landing on Saitama's face, shocking the spectators. Saitama comes out completely unharmed, trying to keep his wig on. As they fight Sneck and Max come and point out Suiryu's fighting style, using only leg techniques and hiding his true strength. As they fight, Suiryu proclaims he will only use kicks to make the fight more exciting and dares Saitama to punch him, only for Saitama to back away. Suiryu analyzes him and asks him about his everyday routine. When Saitama lets it slip he fights monsters, Suiryu quickly blow off his claim on being a hero, stating there is no such thing as good heroes.
At the Super Fight tournament Suiryu bashed on heroes and the industry and kicks Saitama on the head, blowing off his wig. Saitama answers back, telling Suiryu not to get any stronger if he wants to have fun before throwing a punch, stopping before Suiryu's face, and tearing his shirt in the process.