A thousand years ago, I started my training to become a Kaioshin under Master Kaio.
I learned many techniques.
Given my potential, Master Kaio wanted to teach me the Kaioken.
From what he said, it required great physical resistance, something he regretted for himself.
However, it had no impact on my body, proving that I am an exceptional being.
It took me some time to fully master it without any impact on my body.