Breathing Style

Breathing Styles are swordsmanship styles practiced and taught by the Demon Slayer Corps. They're capable of allowing their users to fight on par with Demons and are generally used with Nichirin Blades to slay Demons, with a few exceptions.

Overview
Breathing Styles are swordsmanship forms practiced and taught by the Demon Slayer Corps. The Breathing Styles assembles specific and concentrated breath patterns, which increase the user's lung capacity and amount of oxygen in the blood. This increase of oxygen allows the user to enhance their physical abilities and mental concentration, allowing them to fight on par with Demons, whose physical prowess surpasses that of the average human.

Focused Breathing is also capable of clotting wounds from severe injuries and slowing down the circulation of poison in the bloodstream.

Every Breathing Style currently taught within the Demon Slayer Corps is directly originated from the Sun Breathing, the first one ever created.

Total Concentration Breathing
Total Concentration Breathing, an advanced application of Breathing, is a state where a Breathing Style user inhales the maximum amount of oxygen within a specific breath pattern to raise their physical and mental prowess to their utmost limits. It is often used by Demon Slayers for a brief moment to temporarily boost their combat capabilities to prepare a decisive attack.

Total Concentration: Constant is a Total Concentration Breathing state during the morning, noon, and night, and even while asleep that Advanced Demon Slayers, such as Hashira, can constantly maintain. There is an immense difference in strength, speed, and stamina between someone who can maintain Total Concentration Breathing at all times and someone who cannot.

Learning to maintain a constant state of Total Concentration Breathing requires tremendous effort though, the skill itself is well-known to be quite elementary despite the required effort.

The training process involves blowing into a unique type of super durable gourd. The objective is to blow into the gourd with enough strength to make the gourd break apart. As training progresses, the gourd is replaced by a bigger variation of the same type of gourd. The biggest known gourd is about the size of a chair.

Breathing Hybridization: A swordsman can use more than one Breathing Style technique at a time, allowing the user to take advantage of the advantageous aspects of both techniques. Tanjiro Kamado, for example, can use both the Water Breathing and Sun Breathing styles simultaneously.

Trivia

 * The names of Breathing Styles are very strict. For example, Flame Breathing should never be referred to as Fire Breathing.
 * According to the second fanbook, Breathing Styles were not entirely lost to history, they eventually became just like the Hinokami Kagura is to the Kamado family, a ceremonial practice, a dance so to speak.