Hi...<br/><br/>I just saw a sentence on a book but not sure what it mean...<br/><br/>"The high level of physical activity enjoyed by many Americans <b><u>at play</u></b> has led to the observation that Americans have difficulty relaxing."<br/><br/>Does at play means "fuctioning, developing, working" or "at leisure time"?<br/><br/>Or can it mean something else? Thanks!!