Slick ads, at a cost of $59 million last year, portrayed exercise as cool at an age when outdoor play typically winds down and adolescent slothfulness sets in.

• 去年，有5千9百万美元投入到的精美的广告宣传中。广告引导那些处于因户外活动减少而开始变得慵懒的年龄的青少年们认为锻炼身体也很时尚。