Chapter 15: How to Train your Body

Disclaimer: Naruto is the work of Kishimoto

Naruto decided this was the last Time Loop or this checkpoint the moment he woke up again.

The reason was simply because he had enough Fuinjutsu ability to copy the Resistance Seal which by nature was simple enough but had a LOT of safeties for the user's benefits.

As usually Naruto used his Shadow Clones to continue his extra training using a total of 100 Shadow Clones now that he was comfortable enough with the headaches that came with dispelling enough of them at once that he didn't flinch…that much.

Half of those Shadow Clones were working on combining the Leaf Exercise with Tree Climbing or Water Walking to increase his Chakra Control which he admitted he needed another way to rapidly improve it.

The other half were split into two groups; one was for his Taijutsu which he; the original would be also working on to regain the muscle memories and the second was for his study in Fuinjutsu and speeding up his writing speed as much as possible. He had heard some of his Clans could rapidly write seals in battle; he intended to be able to do that as well at one point…eventually.

When he reached the training grounds where the rest of his team was at; Naruto made a Shadow Clone and instructed it to go there instead of him while he did something else for the 3 hours Kakashi was going to spend being late.

'Now what should I do…?' he wondered; he had a large number of Shadow Clones doing thing so he was going to be updates of his progress with them eventually at bulk which would stop him from training.

He could start training his body but he preferred to do so with that resistance seal Kakashi would give him.

But that was in three hours.

'Guess I can mediate a bit…that helps with bringing my Spiritual Energies up…even if it increases my Chakra reserves even higher' Naruto sat down and started to breath in and out like before calming all the way down to seek what was inside of him.

Diving deeper; Naruto saw his Chakra and it's entirely with Spiritual and Physical energies combining into it. He saw Yin and Yang Chakra being unbalanced as always…wait. What was that? Quickly scanning through; he saw that there was something that was causing his Yang Chakra is swell up and increase.

How did he not see this before?

Looking through for what seemed to be an hour examining his Chakra; especially his Yang Chakra extensively, eventually Naruto saw the same flash of Chakra which quickly combined into his own. The Chakra that came through into his was…red.

'Meaning Kyuubi' he shivered at the thought and why its Chakra was going into him.

Was this intentional?

Or was this by design? It would honestly explain why his Chakra levels were stupidly large and his Yang Chakra being forced to grow that much faster would explain how his stamina and endurance was insane.

In all Naruto could not do anything about the Kyuubi's Chakra seeping in his Chakra System though it would also explain why his Chakra Control sucked like hell aside from having too large Chakra reserves too soon for his age.

If this was the case then he would never have perfect Chakra Control with his Yang Chakra ever increasing. However…with these Time Loops he could increase his Yin Chakra up as much as possible to balance it.

Yes; that would be another thing he needed to do later…which meant he needed to increase his thinking power. Yeah…that was going to take a while which he didn't want to wait for even with a seemingly unlimited amount of time.

"Kakashi-sensei" Naruto started to which Kakashi let no indication he was even remotely shocked for him going up from hiding to talk to him, "Is there a good way to increase the speed and power of my body quickly besides working really hard."

"Hmm?" Kakashi took a glance at his student from his orange book, "Why do you ask Naruto? You just become a Genin."

Naruto sighed and said, "That's the point. I need to become stronger faster but the normal way will take too long. Sasuke is way stronger than me I want to catch up so I at least down drag the team down like Sakura."

It had been a VERY long time since he called her 'Sakura-chan' and some time ago since he called her 'Sakura-san'. Simply 'Sakura' was short enough for him since it kinda rolled off his tongue better than Haruna.

"So you don't want to get stronger than Sasuke?" his teacher asked to which Naruto snorted remembering how he trained with Sasuke; will train with Sasuke to get stronger.

There was a clear line between Genin and Chunin and it would probably take months for him to get to that level; enough time to the Chunin Exams at least.

"Sasuke is the rookie of the year for a reason" Naruto started, "His power, speed and tactical abilities are already Top Genin level and that's with him not awakening his Sharingan and adding on his Fire Ninjutsus. Even I will have a hard time catching up let alone surpassing him in a few months."

"That is true but what about later on?" his teacher pressed on to which Naruto actually thought about it.

What comes after the Time Loops in which he comes out a different person than anyone else…if there was an end to it? But in a matter of physical months…Sasuke would still be physically stronger than him.

"In terms of Ninjutsu I would definitely beat Sasuke with raw power alone…but with stuff like Genjutsu he will always beat me since I suck at controlling my Chakra" Naruto counted with his fingers, "Taijutsu wise it depends on whether I can use Shadow Clones or not; with I'll win but individually he'll win…but in the end it all depends on our physical bodies and what our limits are. No matter what Ninjutsu I can use; it doesn't matter if I can't hit him of he's too fast for me."

Turning to his Sensei, "Which is why I wish to get stronger physically and while I'm at it, I want to get stronger in Taijutsu as well. Next to Genjutsu and my Chakra Control; it's the main thing I'm having issues with."

The last bit was a half lie ever since he trained with Gai and Lee those Loops ago…but what he didn't know didn't hurt him.

"I see…I know a few people who could help…though…perhaps.…" Kakashi said which made Naruto a bit relief since he would train with Gai and Lee again…not that he didn't before even when Kakashi didn't refer to them.

All he had to do was train in a place they went pass by with their morning 'jog' and they would prompt him to train with them.

However Naruto still wanted that resistance seal!

"Kakashi-sensei" Naruto spoke up again, "Is there anything else that would speed my training up? Something that could say make it harder for me to move in general without the use of weights?"

Kakashi did not know how or why; not so much on why but how; that Naruto knew of Resistance seals but it was indeed a good training method. Perhaps he could give one to Sasuke as well…god knows that avenger wants power more quickly no matter the cost. He conveniently forgot about Sakura as well….

"Okay…but wait for Sasuke and Sakura to finish first okay?" Kakashi said to his student who beamed at him which made him happy to see his sensei's son showing a true face of happiness instead of a fake mask.

"Sure the one that's over there is a Shadow Clone either way" He pointed at the Trio doing basic teamwork exercises together with not much success and a lot of frustration. An eyebrow was raised but no questions were asked before they came over.

"WHY IS NARUTO-BAKA OVER THERE?!" Sakura shrieked in close distance, mere metres away from him when she FINALLY noticed him unfortunately.

He had to learn a hearing filtering method…probably from Kakashi-sensei since he didn't seem to be affected at all.

"Mare mare, he has always been here" Kakashi reassure his pink haired student, "Now Naruto's talk with me made me remember some old training methods which I used when I was younger; part of it was the reason I became Jonin at your tender age."

"…."

There was silence between Sasuke and Sakura with the former thinking of how this man can help him gain power to kill Itachi while the latter doubting what her Sensei said. Naruto rolled his eyes at their reactions and most likely thoughts.

"Anyway this method is quite rare since you need a person who is a Fuinjutsu expert like myself or in my case my Sensei who was a Fuinjutsu Master" Kakashi continued.

"Sensei" Sakura shot her hand up, "Who was your sensei?"

Taking a glance to Sakura and to Naruto and back to Sakura, "Minato Namikaze otherwise later known as the Yellow Flash and the Yondaime Hokage."

"…."

This time along with Sasuke and Sakura, Naruto was also stunned silent. THAT man was their Sensei's sensei?! I was no wonder why he was as powerful as he was with that man as a teacher…

"No need for more personal questions, I need to explain what the seal my Sensei designed for my team to use and for you all to use if you want to" Kakashi made that last note as well, "The Resistance Seal is basic in concept but very hard to get right with dire consequences if done incorrectly. The Seal basically restricts you in the same way as if you were moving underwater; very slow and with lots of effort."

Naruto nodded, he knew this much.

"However to do so without…crushing you since you can't apply the same force one every part of your body…like the pressure on your arm being the same as your eye for example…." The Trip shuddered at the thought of what could happen, "Is very difficult since you need to adjust and adjust the seal so it doesn't hurt you aside from the strain."

Making a pointed look Kakashi also added, "Oh and there IS limits to this since the body only take so much strain. The limit for adult males is around 5x the resistance as normal while adult females can take 4x the resistance. For children like you all, you must never go over 3x since it WILL hinder your physical growth. Even rapid regeneration cannot help you there."

"Are there people out there who can endure more strain than 5x the resistance Kakashi-sensei?" Naruto asked.

"Yes" Kakashi nodded, "The Akimichi Clan who have larger bodies due to their Clan's jutsus consuming calories can possibly go to 6x or even 7x depending on the…size of the person. Also there are people who have larger muscles who can endure more and those with special body types or bloodlines who can as well."

Naruto made a note to ask if he was such a person that was included in that list…though it seemed either way he was stuck at most 3x no matter what he did.

"Oh, I'll teach you how to release the seal after I put it on you. Basically you'll experience a speed boost compared to before due to nothing restraining you anymore but you will as a result lose all control of your body in exchange. Every day, release the seal and adjust to the speed for half an hour so you CAN fight without the seal on."

Seeing that his students got the message he continued.

"Anyway I'm going to warn you all. If you choose to take up the seal, it will make things a lot harder to do. Simple things like walking or picking up things will be more difficult than before and it will take you weeks if not months to get used to the feeling of being crushed with weight all over" he warned. Naruto noticed that Sakura looked a bit pale.

With an eye-smile Kakashi then asked, "So…who will take one?"

After questioning some parts of the seal to which Kakashi was a bit surprised that Naruto was talking about Fuinjutsu; which he played off as being interested on how it worked; Naruto got reused to the seal since this wasn't the first time he had it on him.

Now he knew how to make one but he didn't know how to adjust it…he would have to ask Kakashi later about that as well if he forgot...

As expected, Sakura didn't take up the seal making the excuse that she was training hard already and didn't need it. Sasuke immediately demanded it on his body since it was a way to get stronger faster. After Naruto got his seal, Kakashi adjusted the seal on 1.5x which while wasn't too bad; hindered them quite badly in movement and speed.

In all, the best way to adjust with the seal was to get used to them as fast as possible which meant lots and lots of physical activity; which was what Gai and Lee were for. After a month of this; Naruto may be able to get to 1.75x with the seal to train even harder. The 'levels' the seal represented were how much their speed in particular would increase without it on. 2x would make them twice as fast and 3x would make them three times as fast.

Kakashi had no doubt that Naruto would sooner or later get to 3x with the seal and of he was as fast as a normal Chunin with Gai's help with the seal on…

Really too many people underestimate Taijutsu and instead focus more on Ninjutsu which was glaring in their faces or the more subdue Genjutsu. A power punch or kick was as likely to cripple or outright kill you at the same rate as Ninjutsu. Gai and Lee were a frightening example of how Taijutsu could be turned into a deadly art as powerful as some of the more powerful Ninjutsus out there.

And it was a thing that Naruto especially needed to train in due to the Time Loop often reset his body back into a state where he was too weak.

He wasn't lying when he said that Sasuke would continue to beat him due to their bodies' differences. Even if he could outlast the Sasuke, he was simply weaker and slower than him and would end up like a punching bag by the end of the spar.

Kakashi had already told Naruto about Gai and Lee and he would start training with them tomorrow.

He would have to tell Gai about his new student which would both excite him to no end. The only reason why Sasuke was not included with Naruto in this training was that Naruto HAS the stamina to keep up with the green duo.

In terms of body type, Sasuke was like him; someone with high speed and power but will wear themselves out quicker than normal as a result. Naruto was the opposite with glaringly high stamina and endurance built for punishment.

Kakashi had little doubt that if they lived long enough; Naruto would be the more frightening one even against Sasuke with a Sharingan.

Now…let's see how Ayame tries to seduce Yamato into paying for her lessons…giggle.

Like before both Gai and Lee immediately accepting Naruto on training with them. They were especially more happy when they found out that Kakashi placed a resistance seal on him to allow him to train even harder.

"WHAT YOUTH MY ETERNAL RIVAL!" Gai shouted into the background, "TO ENCOURAGE MORE YOUTHFULNESS BRINGS YOU TO BURN WITH THE SPRINGTIME OF YOUTH!"

"YES GAI-SENSEI!" Lee shouted with tears in his eyes as well.

Naruto seatdropped seeing the two men cry, shout and hug each other before they came back to their senses and paid attention to him. He really wanted two things from the training of these two.

The first was to build up his body's strength and seed and the second was to further train his Taijutsu.

He had long since replaced his Shadow Clones and watched them struggle to train as normal with the seal on. Good; they would give him experience when he did those things on his own. His Taijutsu in particular suffered quite a bit with himself slowing down in too many ways and this training would help him a lot.

"My youthful friend" Lee suddenly spoke up, "With the seal on, have you been eating correctly?"

Confused about what Lee just said, Naruto replied, "The usual I think. I know we have to eat three times as much as civilians and I've been eating a good deal of meat and fruits when I can but that's around once a week since the Orphan fund ended when I became a Genin and D-ranks don't give much cash. Plus most of the time I feel hungry like my body needs more food. That's why I ate a LOT of Ramen since they filled me up and costed little."

Both Gai and Lee looked each other grimly seeing the plight of their new training partner.

Grabbing his shoulders, Gai said seriously, "Please tell us if you are in need. Food is especially important since without a proper amount of proteins from meats your muscles cannot develop properly. This will stunt your growth."

Naruto opened and closed his mouth several times taking in this information. Was that the reason why he was so…short?

Ramen was the food of Gods but they didn't really have much in meats or fruits especially. Damn! As much as he didn't want to; he had to cut back on Ramen…shudder.

But with the issue of money…even if he didn't get scammed with his Transformation Jutsu; he still didn't have a lot of money and D-rank missions only paid 5000-50000 Ryo at most each. Besides being boring and more like chores, they pay only barely enough for a Genin to live by-and with Naruto's consumption needs; he needed to eat even more; three times as normal Ninjas which meant nine times more than normal civilians.

No wonder why he was so short; his body needed way more to maintain itself and he suspected a certain demon in him was the reason why he didn't die yet.

"Gai-sensei" Naruto called, "Is there a way to do more D-rank missions?"

"Why do you wish for more youthful missions my youthful friend?" Gai asked not getting the point.

Naruto shook his head with a smile, "Since I need more food as you said; I need more money. And the only way to do that is to do more missions but I bet my team with Kakashi won't do more than three a week and that amount of money won't give me enough to eat…especially now."

"WHAT AN UNYOUTHFUL SITUATION YOU ARE PLACED IN!" Guy cried.

"YES! TO BEAR THE BURDEN OF TRYING TO FIND YOUR SPRINGTIME OF YOUTH AND YET PREVENTED IN SUCH A WAY!" Lee also started crying.

"YOSH! WE WILL HELP YOU EVEN IF WE NEED TO DO THOSE MISSIONS WITH YOU!"

"GAI-SENSEI!"

"LEE!"

"GAI-SENSEI!"

"LEE!"

It took another 5 minutes before they actually got to evaluating what Taijutsu Naruto had without the seal on and to try and improve on it which actually impressed Gai to a certain extent. He knew this would happen since it WAS Gai who helped him before.

Seeing this he had only one thing to do now…to ask Kakashi if he could complete extra missions and without the team if he could; Naruto didn't want to drag three extra people with him if he could.

Plus he had a pretty good plan on completing a lot of D-ranks to fill his account with money.

A day passed and Kakashi brought his team for their first D-rank mission.

It didn't matter that it seemed that Sasuke was struggling more than Naruto with the Resistance Seal on him. He had suspected that with the rapid healing the Kyuubi provided Naruto along with his own Uzumaki heritage; that his blonde student's muscles would grow quicker than normal.

'This is good…giving him the resistance seal was the correct thing to do' Kakashi thought. With this, his Sensei's son would grow stronger more quickly and the day since he would be able to tell him about his parents would come closer.

He had a picture album planned for that occasion.

For him who was the last of his team and Naruto who was his last connection to his Sensei; that was something they would later share.

Sasuke on the other hand was struggling with moving properly.

Every time he even moved, it felt like the aftermath of him training too much; which he actually did but that was not the point. This amount of pain was nothing compared to what Itachi forced onto him. He would get stronger than this!

The raven haired boy watched as his blond team-mate; the dobe; Naruto act as if he was used to this amount of strain on his body. What did that dobe have that he; the Uchiha did not have. Scowling Sasuke stopped himself from thinking too much on that. The dobe's words did help him since it led to their Sensei giving them the seal in the first place.

Plus it was either tolerating the boy or being more like the fangirl trying and failing to attack him on multiple times. It did help that Naruto stopped being annoying and talked to him on ways to get stronger; some of which he had to try later on.

It was one more step to getting enough power to kill Itachi.

But on the other hand the Fangirl…what's her name? Was irritating beyond anything he could believe.

THAT was the top Kunoichi of the year? The one called Ino was equally a Fangirl but she HAS Jutsus to back her up. Hell he would have preferred the stuttering Hyuuga who had a crush on Naruto to be on the team.

She was that useless.

He had seen the looks his Sensei gave Sakura when she tried to attack Naruto…and failed. Such things should not happen on a team and…sooner or later she would be kicked out of the team because of it.

It was only what action that could cause a good enough excuse for that to happen.

Sakura was not having a good time. Aside from the fact that their Sensei was forcing torture onto them in the form of jogging every time they meet up for training; he was forcing time off from her to talk to Sasuke-kun!

After finally getting in the same team as him; she expected nothing to stand in her way to date and eventually marry him! They would have three kids, all of them having his hair and face with her eyes. It would be a PERFECT ending!

But Naruto-baka and their lazy late and useless Sensei would get in her way every time that she wanted to talk to him. All they talked about was something as useless as training. HA! They were Genin; Ninjas now. What use was training so quickly when they had time to become stronger when she got her man with a ring on her finger in marriage?

She had tried to attack Naruto-baka in getting in her way but none of it worked. Each time he would do something to make her look bad in front of Sasuke-kun! Even her Sensei didn't let Naruto-baka be put into his place.

When she marries Sasuke-kun and her parents take their places on the council even if they didn't have interest in it; they would be punished! Nothing stands in the way of her love.

Ignoring the glares that the villagers gave him; they weren't stupid to do anything with his oh so famous Sensei and Jonin as well as the 'Last Uchiha' with him; Naruto walked with his team to the Hokage Tower. He waited patiently when Kakashi got the mission with the cat…

And had to endure another 2 hours of catching the damn thing with Sasuke and himself trying to catch the demon in cat skin with Sakura uselessly cheering Sasuke on instead of trying to help out. He was about his limits now and he wanted to get what he wanted which was clearance to do D-ranks on his own.

So after the cat was delivered and Naruto happily watched it to be tortured before escaping, Kakashi was about to dismiss the team when he asked, "Kakashi-sensei, is it possible for me to individually take more missions on my own?"

"NARUTO-BAKA! WHY ARE YOU FORCING MORE MISSIONS ONTO US?!" Sakura shrieked in all her fury. Her hair was in a bad shape and her hands would soon be rough if she didn't treat them soon.

"Sakura-san, please be quiet" the Hokage ordered silencing everyone in the room at that time; even the other team that just came in as well before continuing, "Naruto why do you need more missions? And why did you request to do them alone?"

"You know how Kakashi-sensei allowed me to train with his…colleague right?" Naruto looked at Kakashi who promptly said, "I requested for Gai to help him with his Taijutsu a bit."

Nodding, the Hokage allowed Naruto to speak.

"Yeah…Gai-sensei pretty much told me that my metabolism rate is so high that I need to eat a lot more even by Ninjas standards where we need to eat on average three times as much as civilians. Because of that I'm lacking money to maintain my training" he explained.

"What are you talking about Naruto-baka. You shouldn't need to eat that much!" Saskura chided ignoring several facts that Naruto said clearly.

Ignoring what Sakura said since he would need to correct it later Kakashi said, "I understand...you want me and Hokage-sama to give permission for you to complete D-ranks on your own because of this reason."

"More or less" Naruto shrugged, "Though I bet that you have a surplus of D-rank missions either way and want someone to at least take a couple more out of your hands."

It took another couple of questions and answers to which pointed to how Naruto would be able to do these missions and whether or not that Kakashi would have to supervise him.

However Naruto pointed out that Gai would agree to help when he had the time and he really didn't need supervision after doing a certain mission once already.

With a heavy sigh where Sasuke and Sakura were dismissed since this didn't concern them, the Hokage said, "Okay…it is agreed that you are allowed to do D-rank missions that will be recorded on your own with a few conditions. The first is that Kakashi or Gai needs to supervise you on the more…delicate missions. The second is that you need to actually complete them and write a report on those missions."

"Report?"

"Yes, report. Each mission no matter how small or large needs to have a report on it. It is to keep track of every mission that goes on this village and something that your Sensei; in this Kakashi has to do all the time. For D-rank; you just need to give a summary along with the completed mission scroll that had been verified to say you completed the mission" the Hokage replied, "Are there any other questions?"

"…."

Naruto thought about it and he had one that had been there for a long time now.

"What's the point of D-rank missions?"

A/N:

Not much to write here but about the diet of Ninjas.

While nothing in Canon actually says that a Ninja needs to eat more food than say a common civilian, everything seems to point out that they eat a lot more than normal to sustain themselves especially in intense training involving lots and Chakra use.

Wave Arc where Naruto and Sasuke were stuffing themselves with food is one example.

In contrast, Sakura remained weak in Part 1 of the series until she steps up her training with Tsunade and possibly eating more food. No offense to Sakura but she would've remained a stick in Part 2 if she didn't eat more. I mean her thighs are a lot thicker than normal due to the muscles there (Strangely enough, no women in Naruto seemed to develop noticeable muscles...)

Which leads to some Fanfics determining that Ninjas needing to eat 3~ times more than civilians to sustain themselves in training.

I find this quite logical if you think about it (Aside from the number which could easily be 10 times higher than a civilian for all I know)

Ninjas are basically those with high metabolisms thanks to the fact of Chakra (Look at Naruto and Ramen. THAT is NOT healthy even for Ninjas). In all, you can say that by using Chakra, you are burning up your resources in your body. The Akimichi Clan takes this and made Jutsus out of that fact.

The more you burn, the more Chakra you use, the more food you need to supply the energy to not end up as sticks every time you come out of a battle.

However if muscles and also Chakra reserves recover at the same rate as a civilian then most Ninjas would only be able to battle once every few days at most. A faster metabolism is literally required for Ninjas to live to see another battle.

Then there's Naruto.

Orphan and probably can't cook seeing he lives off Instant Ramen.

I can easily say that a diet full of Ramen does NOT mean well for him. In fact, I say that such a diet is actually hindering him quite a bit since you need a lot more than what Ramen has to grow which also means that Naruto's growth as a Ninja is stunted as well as his height.

Therefore Naruto eating healthier is a good way to bring his physical growth growing faster than before.

He is here, now getting what his body needs to actually sustain itself without limiting other factors in his body to keep him alive.

Plus, do you actually think he could've grown one bit during the time skip of Jiraiya didn't manage to stuff Naruto's mouth with other foods other than Ramen?

That's a good explanation on why Naruto has such a noticeable growth spurt.