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In the beginning of the Avengers movie, Black Widow finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him; Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something.

Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.

From the script:

                       NATASHA 

You know, for a man who's supposed to be
avoiding stress, you picked a hell of a place
to settle.

                       BANNER 

Avoiding stress isn't the secret.

This doesn't say it explicitly, but implies to me that his choice of location and activity are part of his secret.

In the beginning of the Avengers movie, Black Widow finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him; Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something.

Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.

From the script:

                       NATASHA 

        You know, for a man who's supposed to be
        avoiding stress, you picked a hell of a place
        to settle.

                       BANNER 

        Avoiding stress isn't the secret.

This doesn't say it explicitly, but implies to me that his choice of location and activity are part of his secret.

In the beginning of the Avengers movie, Black Widow finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him; Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something.

Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.

In the beginning of the Avengers movie, Black Widow finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him; Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something.

Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.

From the script:

                       NATASHA 

You know, for a man who's supposed to be
avoiding stress, you picked a hell of a place
to settle.

                       BANNER 

Avoiding stress isn't the secret.

This doesn't say it explicitly, but implies to me that his choice of location and activity are part of his secret.

In the beginning of the Avengers movie, Black Window finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him. Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something. Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.

In the beginning of the Avengers movie, Black Widow finds Banner in India, treating sick children. This isn't just a humanitarian endeavor for him; Banner purposefully surrounds himself with injustice - with poverty, with senseless death - so that he could be constantly angry at something. 

Being constantly angry allows him to keep his anger under control - it's not a sudden spike of anger that disrupts his concentration and lets the Hulk out, it's a constant, background anger that lets him decide when to unleash the green beast.