Allison Williams

For cardio, I do SoulCycle. I really don't like to run, plus I have terrible knees and get bored on the elliptical. SoulCycle is basically a dance party on a bicycle, and you burn calories, and it's so fun.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.