Jin was meditating to understand the Laws of the universe, a necessary step into stepping into goodhood. He had understood them lifetimes ago, but understanding and application were two different things.
His current body reached the peak of power, combined with modern technology and his natural powers. He was as strong as he could possibly be without learning a higher power.
The forces of the universe were powerful, extremely powerful. No mere mortal could simply comprehend them with ease. It would take years of understanding, practice, and sometimes, it could lead to death.
Luckily, Jin had every step completed, so it wasn't surprising when he started using every law with ease. While it wasn't to the point of mastery, he could use them so proficiently that it looked as if he had been practicing them for years.
"Well, no i'll be living even longer now."
