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We see that at the end of Boruto:Naruto the Movie,

> Boruto defeats the enemy by hitting him with what it seems a Chōōdama
> Rasengan (IMHO it looks larger than a Chōōdama Rasengan). I think Naruto
> infused some of his chakra in Boruto's jutsu to make it that big.

We see it took time for Jiraiya and Naruto to master the Rasengan, and Naruto
was actually the only one to take it to the next level by adding his wind
chakra (at the time).

So how can Boruto handle this large amount of chakra? Yes everyone says that
Boruto can easily beat Naruto if you compare them at the same genin stage of
their lives, but that doesn't mean Boruto is trained to manipulate such an
insane amount of chakra. How was he able to pull it off?


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naruto naruto-gaiden
How can Boruto handle a Chōōdama Rasengan?


Let me quote these lines from [wikia](http://naruto.wikia.com/wiki/Rasengan):

> The Rasengan does not require hand seals to perform. Once it is formed, it
> also does not require any additional chakra to sustain it

Although it doesn't require any additional chakra to sustain it (so I guess
once it is formed it can be used by another person, too), but that doesn't
also mean that it will not be difficult; it will be difficult to handle that
chakra and to perfectly balance it.

In case of Boruto's Rasengan:

> Though Boruto's Rasengan is initially much smaller, he subconsciously
> applies wind-natured chakra to it, enabling him to hurl the Rasengan across
> distances. While it loses its physical form shortly after bring thrown, the
> wind and force continue on-course unseen, tricking the opponent to let their
> guard down as sufficient damage is inflicted when it makes contact.

At first, Boruto really tried hard to achieve this stage so there is no doubt
that he won't be able to handle Rasengan. But there is one more point to note:
Boruto subconsciously applies wind-natured chakra to his Rasengan which
perfectly defines that he was able to create Rasengan with that much power.

At the end of the movie:

> Naruto is impressed that Boruto was able to learn the Rasengan and, still
> unable to move, adds his own chakra to Boruto's Rasengan, making it
> gigantic.

So Naruto simply added his own chakra to make that Rasengan much bigger. Since
Boruto also learns how to perform Rasengan while training from Konohamaru
Sarutobi after extensive practice then that's why he was able to handle Bigger
Rasengan. (Note: that it was his own Rasengan but in bigger size than the
usual one.)

Also in Boruto Uzumaki's [wikia
page](http://naruto.wikia.com/wiki/Boruto_Uzumaki), there is nothing mentioned
about Choodama Rasengan (also in movie) in the Jutsu section, so according to
the given information, we must accept the fact that it was not a Choodama
Rasengan.


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answer


The only strain Rasengan users show is from the chakra required to create it -
It requires a LOT of chakra to create. Manipulating the chakra, while
difficult to master, doesn't seem very draining. Even genin Naruto was able to
spend entire days practicing the chakra manipulation part. Since we've seen
Boruto make his own Rasengan, we know he understands the chakra manipulation
part, so he can obviously handle using/attacking with it. He doesn't however
have the completely bonkers reserve of Chakra that Naruto has, so he can't
make the Giant Rasengan himself.

There's no reason to assume that the mechanics of the Rasengan change as it
gets larger, so Boruto's own ability to manipulate chakra flow should be
similarly applicable across all sizes of Rasengan.

I'd even wager that the manipulation part isn't particularly important, since
we see Naruto give his friends Rasengans of their own to use during the Fourth
Shinobi War, implying that it may be a completely self-sustaining jutsu so
long as there is a chakra supply.


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