The next day Naruto and Sayuri met up at the same training ground. When Naruto got there through he took a step back upon seeing his sensei. He did this because whereas the previous day Sayuri had been wearing her Jounin uniform, which consisted of long, green pants, long sleeved shirt, calf-high open toed, boots and a flak jacket, this time though she was wearing her training clothes(1). Naruto said, "Wow sensei, you look different today."
"Very astute Naruto-kun. Yesterday I was representing my country on a political mission, so I was informed that I must wear the typical Jounin uniform of my country, but today it is different. This is what I usually wear."
"Oh, alright; so what do I do now?"
"Well, since you got the handseals perfect yesterday today I want you to work on transferring from the first seal to the second flawlessly."
"Hai sensei," Naruto said as he started making handseals. Due to the practice the previous day Naruto could transfer between the seals by twelve o'clock.
When it was twelve o'clock Sayuri said, "Alright, now that you can do that, time for lunch." Sayuri and Naruto went to Ichiraku Ramen Stand for lunch, where they each had ten bowls of ramen. When they returned to the training ground Sayuri said, "Alright, now that you have mastered the handseals required for Hana Shuriken: Hikarakuyō, before we continue on I need to explain to you the basics of chakra."
"Chakra, what's that?"
"Chakra is considered to be the energy that exists in all living things. Chakra as a whole can be divided into two separate energies, physical energy, inherent in every cell of your body, as well as spiritual energy that you gain by exercise and experience, in other words, training. The spiritual energy is what gives form to jutsu. Many people need to work hard to increase the physical energy within their bodies, you and I though, we only need to gain the spiritual energy as we have the physical energy in spades. This can be rather unfortunate for people like us since having too much of one type can hamper the control of your chakra overall."
"Why is that?"
"Because..hmm...It's kind of hard to explain, so how about this, you know how if the broth in ramen severely outweighs the noodles the noodles will get all soggy before you can get to them?"
"Yeah, why?"
"Well, suppose that the broth is the physical energy and the noodles are spiritual energy. If their physical energy far outweighs a Shinobi's spiritual energy their jutsu will either not have enough physical energy, causing the ninja to try and force the jutsu, or too much, causing the jutsu to be overpowered and, for simpler jutsu, cause them to fail, for higher level jutsu, it will cause them to be really, really, overpowered, causing the shinobi to use up their chakra too quickly and no longer be able to continue."
"Wait! Use up their chakra?"
"Yes, each person has a limited amount of chakra that they can use. The limit can be increased with training of course, but a limit will still exist. When shinobi use up all of their chakra they contract a condition known as chakra exhaustion, which can, although not limited to, cause the shinobi to feel incredible pain and even fall unconscious for a period of time that they need to regain their chakra to a sufficient level. Various jutsu are formed when a shinobi combines the physical and spiritual energies. Understand?"
"Basically I have two types of energy inside me and, to use Hana Shuriken: Hikarakuyō I need to use them both at the same time?"
"Yes, exactly right. Okay, now before you try to do that you need to be able to gain access to it. So I want you to put your hands together like this," Sayuri said, bringing her hands together in front of her chin with her two index fingers pointing up. "And then I want you to try and pull forth the chakra that is flowing inside you, like this," as she said this Sayuri was engulfed by a blue aura of flickering energy.
Naruto's eyes widened in amazement and said, "Right," as he held his hands up like Sayuri was doing. He then closed his eyes and tried to feel for something, anything, inside him that felt like what he was feeling coming from his sensei. He found nothing. He said, "Nope, sorry, not feeling anything."
Sayuri said, "Well I wasn't exactly expecting you to get it the first time that you tried to do it."
"Oh," Naruto said.
"Now, try again," Sayuri said encouraging Naruto to continue on.
Author's Notes:
(1) A link to Sayuri's training clothes and appearance is available in my user profile.
I am aware that the concepts of chakra that I have put forth here may be different from that used in the anime/manga, it merely makes more sense to me this way.