The thing about writing that some people will never understand is that for the writer, it is not cerebral. Writing is physical. I feel exhausted, physically spent, after writing. Not exactly the same as after a work out, or after a night of intimacy, but I will push myself until my body shakes. I stop when I am done, when I have hit a physical limit. I do not believe that people who do not write, seriously write, understand this.

I’m not speaking out of my hat on this. I know about physical limits and I have tested mine. When I was younger, I swam seven hours a day (over three separate workouts). When I was older, I took the helm and held it until for days until storms had passed, even when I was seasick and retching over the stern, even when I had a broken rib. I am aware of myself as a physical being. I know where my limits are, and how to push up to and extend them.

Part of the physicality of writing comes from the sound. When I write, each word resonates. It is like being inside a drum, or suspended in the bell of a trombone. My mind is noisy when I write—not scattered, but genuinely full of noise. And like a conductor, my arms are keeping all the sounds organized, on time, in concert.

Writing calls a world into being. There are no phantoms, no shadows. Each image, every idea, is made real, is pulled from some grey other world into this one. Some ideas and images do not come easily, but must be coaxed, yanked, or held gently—each needs to be evoked and tended in its own particular way—the same way each child needs just this much attention, just this much encouragement. But when they come, what joy.

Sometimes, I have to stop, slow my heart, and wait. I can feel the words begin to come along the inside of my arms, deep in my thighs, in my chest. They shorten my breath and turn my feet unusually cold, almost the only time I feel an actual chill—I am a warm man.

And, well do I know how I become a better writer when I move—when I take long walks, or spend a few thousand yards in the pool, or push my heart rate above 180 beats per minute. Because the writing is physical, and the words have a weight, beyond the blinking cursor on the screen.