Yeah...

[Jen awkwardly shifts in her seat.]

...That...thing I do, where I go super fast? That sort of thing...bodies aren't meant to do that. Whether it's flesh and blood or reinforced steel doesn't matter, things break when you put that kind of wear on them. The nanobots in my blood can fix just about anything, but...they can't fix brain. So...stuff adds up.

Believe me, if I knew any of this before today, I'd never have done that.