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Chakra originally belonged to the Shinju. When Princess 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, Hagoromo Ōtsutsuki, who would become the man known as the Sage of the Six Paths, and Hamura Ōtsutsuki were the first people to be born with chakra. It was Hagoromo who spread chakra to others, intending for the chakra to connect people's spiritual energy so that they would understand one another without even talking. This became known as ninshū, Literally meaning: Shinobi Sect), with his goal being to lead the world toward peace. However, the people did not use chakra in the way the Sage had 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. In the end, they ended up using their chakra in battle, just as Hagoromo's mother Kaguya did. Since being spread by the Sage of the Six Paths, chakra has become a form of life energy that all living individuals produce to some degree and require to survive. 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 can also be visible when performing certain techniques, such as the Rasengan. Of the many different types of techniques, ninjutsu, genjutsu, dōjutsu, and so on, all require the use of chakra. However, taijutsu is different, usually requiring no chakra use whatsoever; 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.
Chakra is created when two other forms of energy, known collectively as one's stamina, are moulded together. Physical energy, shintai enerugī) is collected from each and every one of the body's cells and can be increased through training, stimulants, and exercise. Spiritual energy, seishin enerugī, English TV: Mental Energy) is 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. The general term for the source of chakra, the overall physical and spiritual energy an individual has, is called their "total stamina". The maximum amount of chakra an individual can create and retain at a given time is called their "chakra power-level". Each person's chakra is different and as such gives off a unique chakra signature, which sensor type ninja are able to detect. One's chakra signature can be altered by absorbing DNA from multiple people, as seen in Kabuto Yakushi's case. By mixing various chakra signatures together, it became a whole new one, so that not even a sensor type who was already familiar with him could recognise him by his chakra. Like DNA, chakra seems to be passed from parent to child, with the child inheriting the chakra signatures similar to their parents. Chakra Control, chakura kontorōru) is a term that refers to the control of one's chakra and aptitude at controlling it. In Naruto, chakra takes time and a great deal of training to gradually build up. Thus, the key is not actually having chakra, but being able to sufficiently control and conserve it. Everyone has chakra, but only skilled ninja can correctly "mould" and "manipulate" it to its fullest extent. Moulding chakra involves the extraction of physical energy from the body's cells and spiritual energy from the mind's consciousness, and then mixing them together within the body. In other words, a ninja could create too much or too little chakra for a given technique, resulting in the chakra being used inefficiently. In addition, even if a ninja is able to mould the correct amount of chakra, if they cannot manipulate the chakra properly, the desired technique will not be as effective or will not execute at all. Wasting stamina and chakra will also create weaknesses like early exhaustion, which would hinder the ninja's capacity to fight long-term battles. General training methods for improving one's moulding and manipulation of chakra are the Leaf Concentration, Tree Climbing, and Water Surface Walking exercises. As an in-between stage, some ninja can partially manipulate their chakra. This means they can use their chakra, but not effectively control it, which results in a poorly executed technique. A prime example is when Naruto Uzumaki tried to use the Clone Technique during his Academy graduation exam. To manipulate their chakra more easily, hand seals can be used. With these hand seals, users can control their chakra with higher efficiency, allowing them to execute their techniques more effectively. Different techniques also require the use of different hand seals. Shinobi who are extremely skilled at chakra control can become medical-nin or make more effective use of genjutsu.
