1 invigorating adj. 令人精力充沛的

There's something invigorating about walking outside in the morning and taking that first breath of cold air.

早上走在外面呼吸着第一口冷空气会感觉精力充沛。

2 do sth. on and off = do sth. irregularly 断断续续地做某事

I go for a swim on and off.

我间歇性地会去游泳。

3 bracing adj. 令人神清气爽的

I sometimes go for a bracing walk.

我有时候会去散一散步，这让我神清气爽的。

4 in the open air 在户外

Every morning I walk in the open air for an hour.

我每天早晨在户外散步一小时.

5 energizing adj. 令人精力充沛的

Doing this exercise is really energizing.

做这项运动真的让人精力充沛。

6 take up a sport (=start doing it) 开始玩一项运动

I took up the sport six years ago.

我六年前开始玩这项运动。

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