Rui had to admit that despite his harshest estimates of the difficulty of his training, he had nonetheless underestimated the difficulty of the project that he had undertaken. Generating vibrations from all sources of vibrations within the inner section of his body was extremely difficult.
For one, his mind didn't even have direct control over all the cells in his body.
Thus, he couldn't just 'will' them to vibrate in accordance with his needs because most cells were not in direct connection with the nervous system. The vast majority of cells in his body were outside of his direct control, which is why he couldn't rely on direct control to trigger them into generating more vibrations.
"How the hell did the Gen Temple make this training easy?" He gritted his teeth.