Grandmaster realm body control

“Once you reach the Grandmaster Realm, you can transcend humanity’s physical limits.” Teng Qingshan couldn’t help but smile.

The limit of Internal Martial Arts was being able to completely control every muscle.

As for the Grandmaster Realm, the limit was being able to control and use all the energy of one’s muscles, veins and bones, throughout one’s entire body. That was the reason why a Grandmaster professional could send out a stronger fist despite having the same body as others.

http://volarenovels.com/the-nine-cauldrons/tnc-chapter-9/