Abstract
Once-enthusiastic joggers unlace their running shoes. Entrepreneurs promote armchair exercise. Epidemiologists advocate mild exercise. What do these trends have in common? They may be tied to a trend toward upper body exercise.
Once-enthusiastic joggers unlace their running shoes. Entrepreneurs promote armchair exercise. Epidemiologists advocate mild exercise. What do these trends have in common? They may be tied to a trend toward upper body exercise.
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