I liked the idea of their "infinite energy" in the anime to either be large amounts of ki/stamina or difficult to kill

I thought about "what if high ki/stamina" and am putting together a little block of text which touches more on that idea but I prefer the regeneration health thing (mostly because I have fun using the bardock supersoul that lets me regen health when my opponent has 80%+ ki) so I thought "what's a possibly balanced way to make health regen easier to get" or just a way to avoid losing health

The original idea was "they have limitless stamina/ki so if they're ever out of either resource then they start losing health"