Their relationship could develop as they start to respect each other's skills more. As they train, they see the hard work and determination in each other, which makes them put aside their past grudges. For example, when Naruto manages to dodge one of Sasuke's powerful attacks, Sasuke realizes that Naruto has truly become stronger. This makes him more open to working with Naruto rather than against him.
A really interesting scenario could be that Naruto and Sasuke are training in a place where there is a time - dilation effect. They end up spending what seems like months in the training area, but in the outside world, only a few days have passed. During this extended training time, they not only improve their combat skills but also their relationship. They share stories from their past that they never had the chance to before, and by the time they come out, they are both much stronger and closer as friends and comrades.
One possible plot could be that Naruto, having become much stronger and more experienced over the years, takes Sasuke under his wing to help him master new jutsu. Maybe Naruto teaches Sasuke some of his unique Rasengan variations, and they train in a secluded area away from the village. Along the way, they also have heart - to - heart conversations about their past and how they can better protect the village together.
Well, in the 3 - year training fanfiction, Naruto could also have some intense mental growth. He might learn more about the history of his clan and the ninja world from Jiraiya. This knowledge would not only make him a better ninja but also shape his understanding of his place in the world and his responsibilities.
Perhaps it's an old enemy who has a change of heart. This enemy could think that by training Naruto, they can make amends for their past wrongs. But Naruto, being cautious, denies the offer as he still has doubts about this former foe's true intentions.
Perhaps he's been influenced by someone who gives him bad advice. For example, if someone tells him that natural talent is enough and training is overrated. Also, he could be dealing with some personal problems, like a conflict within his family or among his friends that takes up all his time and mental energy, causing him to neglect training.
The 1v2 training concept referred to the method of a personal trainer guiding two clients at the same time during the training process. We can get some information about the personal trainer's 1v2 training method. First of all, the coach needed to spend time listening to each client's fitness needs and develop a customized training plan based on individual differences. Secondly, setting clear training goals could improve the effectiveness of training. In addition, personal 1v2 training could increase the interaction and sparring between students, thus improving the training effect. However, since most of the search results provided had nothing to do with fitness training, it was impossible to provide more specific information.
In the fanfiction, they could be training under a strict master. This master gives them tasks that require them to combine their abilities. For instance, they have to work together to break through a powerful chakra barrier. Naruto's brute strength and Sasuke's precise chakra control are both needed. At first, they struggle because of their differences, but as they communicate more during the training, they start to synchronize their efforts and finally break through the barrier, growing closer as comrades in the process.
One common scenario is Naruto training with a new or unexpected mentor. For example, he might train with a powerful and reclusive shinobi from a far - off village who has unique techniques to teach. Another is training in a special environment like a pocket dimension filled with dangerous beasts that force him to quickly level up his skills. Sometimes he'll train in a team with other characters who also have something new to offer, like a combination of taijutsu and ninjutsu training that he hasn't experienced before.
It could be due to the current situation in the village. There might be threats that required Naruto to stay. Tsunade, as the Hokage, had to consider the overall safety and stability of the village. So, she denied Naruto's request for the training trip to ensure he was available in case of any emergency.