Eyes closed.
Breathe in.
Breath out.
Back straight.
Breathe in.
Breathe out.
Empty your mind, Lee.
Breathe in.
Breathe out.
Free yourself from the shackles.
Breathe.
Remember the basics of your training. Start at the very begining, Lee. What was the first thing they taught you at the academy and at the monastary?
Chakra. Chakra is essential to even the most basic technique. Through various methods, the most common of which is hand seals, chakra can be controlled and manipulated to create an effect that would not be possible otherwise, such as walking on water, exhaling fire, or creating illusions. Chakra is ordinarily not visible to the unaided eye unless it is highly concentrated or manifested in large amounts.
Good, good. Now, according to the monks, how was chakra introduced into the world?
Chakra originally belonged to the Shinju. When Kaguya Ōtsutsuki ate the fruit that Shinju bore, she became the first person in history to wield chakra. With her new-found power, she ended all the wars that plagued the lands. Her sons, Hamura and Hagoromo Ōtsutsuki, were the first people to be born with chakra. Hagoromo spread chakra to others through a practice called ninshū, intending to create peace by using the chakra to connect people's spiritual energy so that they would understand one another without even talking. However, the people did not use chakra in the way Hagoromo hoped, instead using it to connect their inner spiritual and physical energies. They kneaded their inner chakra to amplify and weaponise it, creating what is now known as ninjutsu.
Since being spread by Hagoromo, better known as the Sage of the Six Paths, chakra has become a form of life energy that all individuals produce to some degree; those who run out of chakra will die. Produced within the "chakra coils" that mainly surround and connect to each chakra-producing organ, the energy circulates throughout the body in a network called the "Chakra Pathway System", which is similar to the cardiovascular system. Certain groups, such as shinobi, have learned to generate more chakra and release it outside their bodies through pressure points called tenketsu in order to perform jutsu. Chakra is not normally visible to the human eye, though it can be seen in situations where a person releases as much of their chakra as possible. This is rarely seen due to the restrictions of eight specific tenketsu known as the Eight Gates, which limit the amount of chakra an individual can release at a single given time
Chakra is created when two other forms of energy, known collectively as one's "stamina", are moulded together. Physical energy is collected from each and every one of the body's cells and can be increased through training, stimulants, and exercise. Spiritual energy s derived from the mind's consciousness and can be increased through studying, meditation, and experience. These two energies becoming more powerful will in turn make the created chakra more powerful. Therefore, practising a technique repeatedly will build up experience, increasing one's spiritual energy, and thus allowing more chakra to be created. As a result, the ninja is able to do that same technique with more power. This same cycle applies for physical energy, except the ninja needs to increase their endurance instead.
At any given time, a ninja will have a "maximum" amount of chakra that they can form and use before it runs out and they need to rest to replenish it. With practice this maximum can be increased, but to a certain extent they are limited to the quantity and strength of chakra that their genetics grants them; Lee remembered that according to the monks, he was blessed with a particularly large and vibrant chakra pool.
Each person's chakra is different and as such gives off a unique chakra signature, which sensor type ninja are able to detect. Chakra signatures are passed genetically, allowing a person's clan to be identified by their chakra; over time, entire populations can have perceptibly different chakra. Each person's chakra also has a unique "color" that can be seen by those with dōjutsu.
While practically all types of jutsu require chakra to be performed, taijutsu does not; stamina is all that is needed. While the ninja still needs a set amount of chakra to live, regular taijutsu doesn't require any active moulding or manipulation of chakra, with few exceptions. A standard attack like a punch or kick falls into this technique category. For Lee, this was a particular blessing; the monks of the monastary taught exclusively taijutsu and the art of using chakra to enhance one's body. Lee was no stranger to empowering his body with chakra in order to achieve wonderous effects. But there was more.
What did else did that teach you, Lee?
Chakra Control.
Good. What was so important about Chakra Control? Do you remember?
Because chakra takes time and a great deal of training to gradually build up, the key to its use is not actually having chakra but instead being able to sufficiently control and conserve it. This is called chakra control. In order to have good chakra control, a ninja should only mould as much chakra as they need to perform a given ability. If they mould more chakra than is needed, the excess chakra is wasted and they will tire out faster from its loss. If they don't mould enough chakra, a technique will not be performed effectively, if at all, likely creating problems in a combat situation.
Good. Now, how did one train thier chakra control, Lee?
General training methods for improving one's moulding and manipulation of chakra are the Leaf Concentration, Tree Climbing, and Water Surface Walking exercises. A good way to build up chakra in the body is to spin it into a tight spiral; Whether to spin the chakra left or right is dependent on the way the user's hair grows. Hand seals are often used to manipulate chakra more easily, allowing shinobi to execute their techniques faster and more effectively.
And once you've mastered chakra control? What then?
You create Ninjutsu. When creating a ninjutsu, the two methods of manipulating chakra are referred to as shape transformation and nature transformation. Shape transformation deals with controlling the form, movement, and potency of chakra. Nature transformation deals with changing the physical properties of chakra into an element. There is also the nature transformation of Yin and Yang, which deals with changing the ratio of spiritual and physical energies within chakra. These two methods can be implemented separately or together in order to create a technique, though ninja who can use both simultaneously are said to be rare.
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