For Dan Eisenhardt—a competitive swimmer for more than a decade, beginning as a 9-year-old in his native Denmark—the data he needed in the water, what he could never know in the water, was his splits. His event was the 1,500-meter freestyle, the longest slog in the sport, a near-mile of grinding exertion divided into 15 laps of 100 meters apiece. As with every distance sport, pacing is all; lag your target time on the first two laps and you may never catch up, but accidentally beat it and you’ll load your tissue with lactic acid, doom your endgame. How fast was his last lap? How did it compare to his usual pace? His coach up on the pool deck could know, his parents in the stands could know. But Eisenhardt, at war in the water, could only guess.
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