Saitama Was The Strongest Hero in The World

Saitama was a hero that want to search enemy just to have fun. His super awesome power has made him became extremely boring. When he met his enemies, he defeated them just with one blow. That's why people call him 'One Punch Man'. But he never become ignorant because of his power.
One day, a powerful cyborg, Genos had beaten up by some bad heroes. Saitama saw and help Genos. As usual, he just use his one blow to defeat them. Genos impressed of Saitama super power and asked to become his disciple and called Saitama as Senpai. Saitama just accept because he doesn't had any feeling. He had not feel happy, sad and fear anymore.
The cyborg want to know how his Senpai became so powerful. With a serious face, Saitama said "Just do one hundred push up, one hundred sit up, one hundred half squad and jog 10km every day.". Genos didn't believe what his Senpai said.