It could be that Naruto ate a special kind of magical fruit during one of his adventures. This fruit might have given him the physiological adaptation to be able to breathe underwater, similar to how some fictional characters gain powers from special items.
One plot development could be that Naruto discovers an underwater world full of secrets and new enemies. He might have to use his new ability to navigate this world and uncover the mysteries there.
In most novels, breathing underwater is often depicted through magical or technological means. Like special potions or advanced diving suits with oxygen supply systems.
Well, it would make his attacks more aggressive. He could use the fire - breathing to surprise his opponents, like suddenly shooting out a stream of fire when they least expect it. This would force his enemies to keep their distance more often.
In some fanfictions, Naruto might acquire the ability to use Kamui through a special encounter. Maybe he meets an ancient sage who imparts this power to him, seeing Naruto's potential and his need for an edge in battles against powerful foes.
: Sasuke could be a possible cause, not out of malice but maybe during an intense fight where things get out of control. They have had some really rough battles, and in the heat of the moment, Sasuke could accidentally use a technique that affects Naruto's ability to breathe. Also, there could be some new villain in the fanfiction that we don't know about yet, who has a specific grudge against Naruto and targets his breathing as a way to weaken him.
Maybe he's in a tight situation like being trapped in a small space or under some kind of magic spell.
I'm not sure specifically about a 'breathe slow naruto fanfic'. However, you can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. There are thousands of Naruto fanfics there, and you might find one that has a slow - paced, breath - like rhythm in its storytelling.
A 'breathe slow naruto fanfic' might be special because it could offer a more laid - back and reflective take on the Naruto universe. Instead of the usual fast - paced action, it might focus on the characters' inner thoughts and emotions, like Naruto's journey of self - discovery at a more leisurely pace.
The 'breathe in and out' can symbolize her learning to control her emotions. For example, when she used to get angry or frustrated easily, she now breathes in calmness and breathes out impulsiveness. This helps her make better decisions in battles and in her relationships with her teammates. She becomes more level - headed and her growth as a shinobi is enhanced.
There were different ways to breathe while running. The breathing method was suitable for different running intensity and personal preferences. One common method was abdominal breathing, which expanded the abdomen when inhaling and contracted when exhaling. This breathing method could help to use oxygen more effectively and maintain a stable breathing rhythm. In addition, he could also try to sync his breathing with his steps, letting the rhythm of his breathing follow the rhythm of his steps. Depending on the running intensity, different breathing rhythms could be used. For example, the breathing rhythm of 3 steps 1 inhale, 2 steps 1 exhale (3:2) for jogging and moderate running, the breathing rhythm of 2 steps 1 inhale-1 step 1 exhale (2:1) for fast running, and the breathing rhythm of 2 steps 1 inhale-1 step 1 exhale-1 step 1 inhale-1 step 1 exhale (2:1:1:1) for intermittent running or high-intensity running. In short, choosing a breathing pattern and rhythm that suited you could improve your running efficiency and comfort.