Eight Inner Gates

Also see the original: Eight Inner Gates The Eight Inner Gates are a series of regulators located across the human body. These regulators control the flow of Chakra in order to prevent a Shinobi from overexerting themselves. A Shinobi can release these gates in sequence in order to provide themselves an exponential strength increase in the line of battle. However, this comes at the cost of significant harm to the body as a result of the muscles straining themselves during intense physical combat. To date, only two gates have been revealed:

First Gate: Gate of Opening: opening of this gate results in a small shockwave from the user and allows them a considerable increase in strength. However, after the strength increase wears off, the user will be left in a state of extreme physical pain due to intense muscle strain.

Second Gate: Gate of Rest: opening this gate will result in a larger shockwave emanating from the user, capable of breaking apart concrete. With this gate, physical strength and stamina is increased further, however, the physical pain that will result afterwards is also significantly increased.