Oh, c'mon, don't just confirm my theory about you not having to work out at all...

[ Jack does sound slightly annoyed, but it's at least not in the dangerous way that his voice can easily take on. No, this is just Jack, the person, being mad that someone doesn't have to work as hard as he does to keep in shape. ]

And the answer is because it's good for you. [ a pause, and then, ] Okay, and maybe because working out alone is really goddamn boring. Work with me here.