How did Saitama really get strong?

Related questions

1. Is one punch Man Season 2 out yet?
2. Does Saitama have a limit?
3. Is one punch man on crunchy roll?
4. Can Saitama die in space?
5. Does the one punch Man Workout Work?
6. How many seasons does one piece have?
7. Is one punch man available in English?
8. Will one punch Man Season 2 be on Crunchyroll?
9. How many seasons of one punch man is there?

Tags

1. #source
2. #result
3. #loses
4. #powerful
5. #power
6. #becomes
7. #expect
8. #stronger
9. #punch
10. #parody
11. #explanation
12. #intended
13. #training
14. #incredibly
15. #codes
16. #saitama
17. #making
18. #therefore
19. #shonen
20. #order
21. #become