linking flexible fixed volume muscles to rigify rigs

I’m trying to consider every aspects into my learning process and i am currently into figuring out how to make the rigs inflated with muscles that would perfect the model’s deformation. I’m also working in a gaming perspective so i’m unsure if any gaming engine would be compatible with such rigs… Lighten up my way ô wise blender artists! :slight_smile:

What i found out yet (is it up to date?)

And which seems really rigify compatible…

Thank’s in advence! :slight_smile: