THERE is no drug — recreational or prescription — capable of inducing the tranquil euphoria brought on by swimming. I do all my best thinking in the pool, whether I’m trying to figure out how to treat a patient’s complicated ailment or write a paper. Why that is is mysterious, but I have a theory.
Assuming you have some basic stroke proficiency, your attention is freed from the outside world. You just have to dimly sense the approaching wall before you flip turn and go on your way. Cut off from sound, you are mostly aware of your breathing. You have to traverse boredom before you can get to a state of mental flow. Now your mind is free to revel in nonlinear, associative thought. Nothing has to make sense. You suddenly become aware that time has passed. You are not sure what elapsed in that strange discontinuity, but the solution to a problem that escaped you on land is perfectly obvious emerging from the water — a rapturous experience.