B next generations

In the anime the ninjas of next generations because their nature was totally contrary to the ideals of the samurai. In the case of the samurai, the daimyō could not expose them to jobs, because if their reputation were discovered they would be shattered. For that reason they preferred to hire ninjas, so that they could carry out this type of work.
The origins of the shinobi, another word used to refer to this group of next generation are uncertain, although its more precise antecedent is in century I6 and it is not until century XV when its activities and characteristics can be fully identified.

Next generations For their purposes they used a wide range of weapons and artifacts such as swords, shuriken or chains, as well as being experts in the preparation of potions. In the same way, they were trained in the use of the "art of disguise", which they often used to go unnoticed depending on the situation prevailing in the place where they had to be introduced, unlike the typical dress with which today Are identified.

What is the chakra?
In the anime the chakras are immeasurable (non-measurable) energy centers located in the human body next generations.
The Chakra (ャ ク ラ ラ, Chakura) is the vital energy of the body, which is essential for any jutsu, even for the most basic, is a mixture of physical energy (エ ネ ル ギ ギBeing alive and spiritual energy (エ ネ ル ギ ギ ー, seishin enerugī) gained through exercise and experience.

Chakra is a Sanskrit word meaning wheel or vortex and refers to the seven energy centers that make up our consciousness and our nervous system.
The chakras are not physical. They are aspects of our consciousness, like the auras, next generation of the new anime.