Medicine: No-Sweat Exercise

Rising sales of tennis equipment and enrollments in health clubs suggest that the U.S. is becoming a nation of fitness fiends. Yet for every jogger puffing through a park, there are probably still a dozen more Americans for whom a stiff workout is getting up during a TV commercial to fetch another beer. Most physical-fitness advocates approach this sedentary majority by exhorting or even trying to scare them into activity. But Laurence Morehouse, a physiologist at the University of California at Los Angeles, is currently winning many converts with another approach. Out since...

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