Why does exercise make us happy and calm?

为什么锻炼能让我们快乐和镇静？

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My happiness project has turned me into a sleep zealot. If I want to feel happy, calm, energetic, and mentally sharp, I must get enough sleep.

我的快乐方案让我变成一个睡眠狂热者，如果我想感觉快乐，平静，有活力，思维灵敏，我必须有充足的睡眠。

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Everything is EASY. I am relaxed, calm and happy.

一切都很简单，我很放松、平静和快乐。

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It's not as if Sweden was happy and calm and contented until last week and then, suddenly, this trouble started.

NPR: Violence In Europe Leaves People Fearful

With a breathy, calm and happy demeanor, Hecht is addictive to watch.

WSJ: Review: 'The Assembled Parties' a terrific drama

"Shane sounded very calm and content, happy to be in a beautiful environment, and made absolutely no mention of the risk whatsoever, " Meckfessel wrote.

CNN: Hikers' friend says they crossed into Iran by mistake