Subject: Theoretically, could having both red &white muscle fiber make a superhero?

I'm curious about the possibility of "real" superheroes. Even though I think
it's impossible, theoretically, what if someone had some sort of birth defect
and had both red and white muscle fiber, and especially someone with
extraordinary inherited physical strength? Would this person have unbelievable
strength & stamina and basically be superhuman? If someone had an unbelievable
concentration of this dual muscle fiber and also worked out much more often than
the average person, could they theoretically have an insane amount of muscle
mass--i.e., enough to stop knives/bullets?

Re: Theoretically, could having both red &white muscle fiber make a superhero?