As little as five minutes of exercise a day in the great outdoors can improve mental health, according to a British study published in the journal Environmental Science and Technology.

英国一项研究显示，只要每天在户外运动五分钟，人的精神状态就会改善，不但心情会保持舒畅，而且有助增强自信心。有山有水的环境益处尤其明显。

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Physical activity is a learned behavior, says one of the competition's judges, Avery Faigenbaum, a professor of health and exercise science at The College of New Jersey.

CNN: Schools given $25K to help kids move

The next explosion comes from Tim Noakes, the Discovery Health Chair of Exercise and Sport Science from the University of Capetown in a commentary ( Role of hydration in health and exercise) in which his take can succinctly be summarized as, if you get thirsty you should drink and that over-hydration is a much more common and dangerous risk to the athlete than dehydration.

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