How did Saitama get so strong?

Related questions

1. Does Saitama have infinite power?
2. How did Saitama become so strong?
3. Will there be a season 3 of one punch man?
4. How Saitama got his power?
5. Can Saitama fly?
6. Does Saitama need to breathe?
7. Can Saitama be blast?
8. Can Saitama breathe in space?
9. Why is Saitama so strong?
10. Is blast stronger than Saitama?

Tags

1. #becomes
2. #capacities
3. #simple
4. #source
5. #saitama
6. #punch
7. #heroes
8. #loses
9. #making
10. #power
11. #incredibly
12. #training
13. #compared
14. #result
15. #powerful
16. #shonen