我一点也不确定他会喜欢新鲜空气，并在茂盛的草丛里锻炼身体。
I'm not at all sure that he would take to all that fresh air and exercise in the long grass.
或许你的朋友每天都跑步，他能鼓励你也去锻炼。
Maybe your friend goes for a run every day, and can encourage you to exercise.
如果有任何改变，他也会让被试来看是否这种效应是由于锻炼的强度造成。
He is also having the subjects walk to see whether the effects, if any, are because of the intensity of the exercise.
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