

A Saiyajin can multiply his power if he takes great damage or is near death
and is able to heal himself afterwards.

With that ability alone, they could rinse and repeat countless times before
the first encounter with the Androids (you can't be too safe).

Goku and Vegeta have their pride and all, I get that. But Trunks and Gohan are
much more rational (especially Future Trunks). So why didn't they do what
Vegeta did on Namek with Dende for example?


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dragon-ball-series
Why didn't the Saiyajins raise up their power energy?


There are multiple things against this.

  1. It needs a close death experience to gain power and they need to be healed afterwards, as Dende wasn't on earth at this time and they surely don't want to eat all the beans. It would take a lot of time to regain their full strength and they could die trying of course.
  2. Vegeta and Goku would never use something like that to gain power because of their pride. 
  3. They might have underestimated the cyborgs
  4. Future Trunks was not in this timeline on that time
  5. Gohan was a kid at this time and he "had to study". His mother would have never allowed him to be beaten half dead and recovered just to increase power.

> 6\. Future Trunks might not be aware of this fact, since when he lived Goku
> and Vegeta were already dead and Gohan might never told him that.

As Exception from 2:

> Vegeta did this on Namek cause he hated Frieza, he destroyed the planet
> Vegeta and killed nearly all the Sajyans. (As exception of 2.)

Those are the reasons against, it in my opinion. There might be more, and some
might not be right, but I hope you can use this answer.


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## First things first

  * Goku use in the spaceship, while going to Namek. (Seeds)
  * Vegeta ask Dende to help him with it in Namek. (Heal)
  * Gohan get power up thanks to the [Old Kai](http://dragonball.wikia.com/wiki/Old_Kai). (Without getting damage, only releasing the hidden power)
  * Trunks and Goten never needed the power up (they used only the SSJ 3 form to do this)

* * *

## The Androids appearance

> Three years have passed since the visit by the mysterious Future Trunks.
> Goku, Piccolo and Gohan leave to go and face their destiny against enemies
> they have only heard about, but not seen. They are as prepared as they could
> be, though Piccolo wishes they had more time to become stronger.

Source: [The Androids Appear - Summary (1st
Paragraph)](http://dragonball.wikia.com/wiki/The_Androids_Appear)

The point that need to be considerate here is: **You need to train your
technique not only your power (check out how boxers or others professional
fighters train before a fight)**


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There was also the possibility they could have died while trying this, so it's
not such a good strategy.


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