The Harvard researchers looked at the level of optimism of the women, as well as other factors such as race, diet, physical activity level and overall health.

哈佛大学研究人员查看了这些女性的乐观程度，以及种族、饮食、身体活动水平以及整体健康状况等因素。

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Maintaining a level of daily physical activity may help mental functioning, says Carl Cotman, a neuroscientist at the University of California at Irvine.

加州大学欧文分校的神经学家卡尔·科特曼表示，每天保持一定的体育锻炼可以促进心理机能。

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They answered questions about their level of physical activity as teenagers and at age thirty, fifty and late in life.

VOA: special.2010.07.07

In fact, in the summer of 2012, the CDC reported that more Americans were walking for exercise, with those who walk being nearly 3 times more likely to meet the recommended level of physical activity.

FORBES: Brisk Walking or Running: Both Reduce Risk for Heart Disease

Rather than the exclusive focus on BMI and weight loss, focusing on maintaining an adequate level of physical activity throughout life is likely to be the most effective way to counter the deposition of abdominal fat and the adverse metabolic changes that accompany it.

FORBES: How Useful Is Body Mass Index In Predicting Long-Term Health?

Physical activity levels were much higher among children, where the recommended level is 60 minutes each day, including school-based activity.

BBC: Scottish Health Survey: Obesity still problem for Scots