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During the Chunin exam,

> when Lee fights Gaara, Kakashi says that as you open more Gates, the risk of
> death rises.  
>  
>  Well, when Guy fights Kisame, Guy has already opened several Gates (up to
> 6) before the final attack, and they have been open for quite a lot of time
> (relatively) before the seventh Gate is opened.  
>  
>  And of course as he opens more Gates, with his stamina rate supposedly
> decreasing exponentially, I'm pretty sure he was supposed to be " **pretty
> exhausted** ".  
>  
>  But still, when he opened the seventh Gate, he still had enough time to
> talk and stop Kisame from escaping.

Shouldn't this be too much for him?


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naruto
How do Gai's Gates work?


No, although opening the six and seventh gate is extremely dangerous, Guy
Sensei has gone through extensive training as can be seen whenever he makes an
appearance, he's almost always pushing himself to his limits which allows him
to withstand the effects of the eight gates and use the technique with minor
repercussions.


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No, you're not _quite_ right about it.

There are eight gates at total. Each gate is a special point in the body that
limits the flow of chakra. This is done in order for the body to live longer
(more chakra flowing = the body is expiring faster). Opening a gate lets
chakra flow freely through it, giving the shinobi a boost in his powers, but
as a price his body is suffering from that power greatly.

Each gate gives a boost in a special power, e.g. the first gate removes the
restrains on the muscles, the second improves physical strength and re-
energizes the body, and so on.

Now, opening the gates is very dangerous by itself, and it's becoming more
dangerous the more gates you open, that's right. The reason for that is that
the body simply can't stand the chakra, and gets damaged by it. That's why
it's hard to open the gates, and it requires a lot of training to use them.
Guy has gone through a lot of training to learn to use that much gates though.

As for the side effects, the seventh gate (which Guy used) causes the user's
muscle fibres to be

> ripped to shreds, causing intense pain if anything or anyone touches them

and finally the last, 8th gate gives the user some tremendous power, but costs
him his life.

So, to summarize: since Guy has gone through a lot of training to learn to
open the gates and use their power, he can use them in the battle. Of course,
there are side-effects, even for him, but they usually happen after the battle
when he closes the gates once again. Nevertheless, opening the last gate would
cost him (or anyone else, for that matter) his life.

* * *

source: [Naruto Wikia - Eight
Gates](http://naruto.wikia.com/wiki/Eight_Gates).

* * *

**Edit** : it's wrong to say that guy doesn't suffer from opening the gates,
he **does** , though not immediately, that's probably why you were confused.
It happens in chapter 512 of the manga, after

> Kisame uses water prison and kills himself.

Here's a screenshot with Guy starting to suffer from the Gate opening (not
sure if it's a spoiler, but I'll mark it as one just in case):

> ![enter image description here](https://i.stack.imgur.com/j6VIt.png)


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answer


Each Gate requires immense Physical strength, this is why Lee and Gai train
their body without using chakra but using weights, punching logs/trees. This
training increases the strength of their bones and muscle so when they do open
the gates the limit release that comes with the increase chakra does not rip
them apart.

Every gate once opens releases a restrain in the physical body along with
immense chakra. Any ninja besides Gai, Lee or the Raikage opening the gates
would be rip apart because instead of using 10-30% of there max muscle/bones
they are using 100% thus breaking.

Tsunade/Sakura power comes from perfect chakra control not actual physical
training this is why Sakura goes from being not able to lift anything at 12
years old to breaking dozens of meters of ground in just 2 years.

The difference in this is that Gai and lee posses more durability, defense,
endurance, stamina, than both Tsunade and Sakura because they tain their body
but they don't posses anywhere close to the amount of chakra control they do,
no one in the series does. while it may seem like chakra strength vs physical
training strength is no difference in reality it is, if Gai and lee run out of
chakra they still posses their superhuman like physique to somehow get away,
but if Sakura losses chakra/runs out she would become fodder and would be kill
easily, because 100% of her power comes from chakra.

If you read any Wuxia/Xinxia novel a physical refinement character using
weights/gravity/water pressure can increase his strength in bones, muscle,
flesh, organs to reach a degree where his skin is hard as diamond.

No ninja in the series besides the Raikage has anywhere close to even having
skin/bones as hard as a rock as majority of the ninja can be hurt by normal
sharp kunais, there are ninjutsu that increases the body defenses like Kakuzu
earth ninjutsu and sage mode but these are once again chakra depended, while
the body is 24/7 on, requires no chakra and requires no energy to sustain
besides food.


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