What is the source of Saitama's enormous power?


I have seen only the anime and not the manga. I am utterly curious about the
ability and power of Saitama.

In the starting episodes, he mentions that he trained very hard and also
details his training regime.

However, I am still curious to know: is there any mention of the source of his
enormous power somewhere in the Manga?




The anime version of One Punch Man is really accurate on regard to the manga
so nothing has been revealed in the manga that hasn't in the anime.

As you mentionned, in the manga, Saitama followed what he would call a hard
training every day :

  * 100 push-ups
  * 100 sit-ups
  * 100 squats
  * 10 kilometers every day
  * no air-conditioner

[![Saitama
training](https://i.stack.imgur.com/yCJUD.png)](https://i.stack.imgur.com/yCJUD.png)

As a result, Saitama loses his hair, and becomes incredibly powerful.

* * *

This training **is** the source of his power. Keep in mind that One Punch Man
[is intended as a shonen
parody](https://anime.stackexchange.com/q/29034/15542) as it is making a
parody of its codes.

In a lot of shonens, training is a main part of the manga.

As an example, in Dragon Ball, the sayans spend years in the [Hyperbolic Time
Chamber](http://dragonball.wikia.com/wiki/Hyperbolic_Time_Chamber) in order to
become stronger.

By making the training of Saitama so simple (compared to the heroes
capacities), One Punch Man is making fun of this Shonen code. Therefore we may
not expect any more explanation on what Saitama did in order to become
stronger.




The anime version of One Punch Man is really accurate on regard to the manga
so nothing has been revealed in the manga that hasn't in the anime.

As you mentionned, in the manga, Saitama followed what he would call a hard
training every day :

  * 100 push-ups
  * 100 sit-ups
  * 100 squats
  * 10 kilometers every day
  * no air-conditioner

[![Saitama
training](https://i.stack.imgur.com/yCJUD.png)](https://i.stack.imgur.com/yCJUD.png)

As a result, Saitama loses his hair, and becomes incredibly powerful.

* * *

This training **is** the source of his power. Keep in mind that One Punch Man
[is intended as a shonen
parody](https://anime.stackexchange.com/q/29034/15542) as it is making a
parody of its codes.

In a lot of shonens, training is a main part of the manga.

As an example, in Dragon Ball, the sayans spend years in the [Hyperbolic Time
Chamber](http://dragonball.wikia.com/wiki/Hyperbolic_Time_Chamber) in order to
become stronger.

By making the training of Saitama so simple (compared to the heroes
capacities), One Punch Man is making fun of this Shonen code. Therefore we may
not expect any more explanation on what Saitama did in order to become
stronger.

