Shihouin couldn't sit around and be idle all day. If he was going to become a strong shinobi that was noticed by his village he would have to toughen up and do it quickly. However, there was something stopping that. His current strength level with Katon techniques wasn't where he needed them to be. If Shihouin wanted to be an excellent Uchiha, he would have to use fire techniques with relative ease due to the clans natural affinity with Katon techniques. For a second he wondered if he could create more fire techniques but realized that would be a waste of time. The Goukakyuu was a technique that worked well and was thoroughly worked out by the clan, there was no need to create any more fire techniques besides the Goukakyuu and the Housenka.
Shihouin did realize a small flaw in both of the techniques. With the scroll information from the fire techniques, it was obvious that even some of the skilled ninja were using their techniques wrong. Fire required breathing and breathing for fire techniques required a massive amount of lung power with the use of kneaded chakra. If an Uchiha could summon a large amount of air to match the chakras for the technique, the fire would come out fine. The problem was the way they were breathing. Shoulders up and throwing their head back to suck in air. With this in mind, Shihouin's training was simple. He would come up with a technique called. "Shihouin's Breath."
It was a low ranking technique but it was really useful. Instead of breathing incorrectly Shihouin would breath by extending his diaphragm and get more air that way. It would also erase the time it took to breath incorrectly and reduce his movements. The technique was simple, when you breath in, imagine that your air is going towards your belly button instead of your chest. Condensing the air down there forces the abs to flex outward as if you were growing a belly. This breathing technique forces the lungs to make more upwards and downwards space where as breathing with your chest forces them to try to expand outwards where there is less room. Breathing properly would allow for more air, which could mean more fire and also allow him to use his fire techniques better.
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