Each human has their own physical limits. In the case of cyborgs, they're simply just humans with mechanical parts, and likewise, they possess much greater potential than any normal human or robot. With their mechanical parts, they possess greater strength, speed, agility, and other attributes compared to humans, and likewise have a much greater limit threshold. But what happens when the body has reached its limit? What happens when the body, out of survival instinct, attempts to reach beyond its normal limits?
First, we go over what is needed to access the body's inner instincts. In this series, it directly uses Mushin (lit. No Mind). Mushin is a state of being that is accessed by essentially removing all thoughts and desires. This causes the body to move more fluidly in combat and act spontaneously, as if it is second nature. This concept is referenced in both Yu-Gi-Oh! 5D's and Dragon Ball Super as "Clear Mind" and "Ultra Instinct" respectively, but neither directly address it. In Final Fantasy XIII, and will be addressed in Agito, the saying "it's not a question of can or can't, you just do it", can also be an allusion to Mushin, as it can symbolize that it "is not a question of can you ride a bicycle or can you not ride a bicycle or can you avoid a punch or not avoid a punch, you just do it".
Moving on from Mushin is also a separate state of being, a literal transformation actually, that is distantly related to Mushin. When a Cyborg's body is on its last legs, essentially at its physical limits, it is possible for the body to use every ounce of its remaining strength to surpass those limits with a currently unnamed transformation. This can only be done instinctively, as the mind's thoughts and assumptions will only distract the brain from achieving this enlightened transformation.
Once achieved, the mind will use its newfound power until the body collapses from exhaustion. Depending on how much energy the body has left, that is enough time for the power of the transformation to leave an imprint on the body so that the mind when filled with thoughts can gradually adjust to the power so that the user can use it without the need of transforming, increasing their limit capacity even further. This can be done indefinitely for as long as the user breathes, provided that they are capable of forcing their body to new heights to begin with each time.