If an ordinary martial artist cultivated their Internal Breath cultivation method to a certain extent, their body would naturally be strengthened. Be it their flesh, meridians, or bones, they would be strengthened.
This was the path that martial artists had to take in the first place. Moreover, they would obtain further and greater strength after becoming stronger.
Chu Nan was an obvious and even extreme example.
The degree of tempering of his body far exceeded ordinary standards and the strength of his Internal Breath.
To be honest, even if he had broken through to the seventh level of the Nine Revolutions Technique and every time he cultivated his Internal Breath, it had only been a year since he obtained the data ability of an A.I. last year and began to continuously break through the Nine Revolutions Technique. The time was still short, so the strength of his Internal Breath was only similar to a third-stage Void Break Martial Artist, and it was even slightly insufficient.