Physical strength is as necessary as artistic sensitivity

An excerpt from a 2004 interview with Murakami in The Paris Review brings home the connection between physical strength and creating extraordinary work:

When I’m in writing mode for a novel, I get up at 4:00 A.M. and work for five to six hours. In the afternoon, I run for ten kilometers or swim for fifteen hundred meters (or do both), then I read a bit, and listen to some music. I go to bed at 9:00 P.M. I keep to this routine every day without variation. The repetition itself becomes the important thing; it’s a form of mesmerism. I mesmerize myself to reach a deeper state of mind. But to hold to such repetition for so long—six months to a year—requires a good amount of mental and physical strength. In that sense, writing a long novel is like survival training. Physical strength is as necessary as artistic sensitivity 

Haruki Murakami