[slazaro]

Or a particle accelerator in his basement, generating an element that didn't exist before.

[maxerickson]

Or an AI that is smarter than most humans, and super strong materials and super powerful miniaturized actuators and on and on.

And don't forget being a stone cold killer. He's breezy cool in lots of scenes that follow the deaths of multiple adversaries.

[IntronExon]

A sociopathic, yet brilliant biollionaire? Probably the most realistic part.

[Cheyana]

Or a serum injected into your body, while being exposed to radiation, to transform you into a peak physical specimen.