12/13 How can we maintain our health in the winter?

It's harder to stay healthy during the winter season.
* stay healthy: 건강을 유지하다.

We're more susceptible to catching colds because our immune system gets weaker
* be susceptible to (= be prone to): ~하기 쉽다.
* catch a cold (= get a cold): 감기에 걸리다.
ex> The elderly are more susceptible to getting the flu.

Because windows and doors are tightly shut, the air inside gets trapped.
* get trapped: 갇히다.

The stuffy air is the perfect envirnment for the germs to spread.
* stuffy air: 탁한 공기, Lacking sufficient ventilation; close. cf> stuffy nose: 코가 막히다.
* germ: bacteria

People also tend to put on some extra pounds.
* put on extra pounds(kilos): 체중이 늘다.

One thing we can do to avoid getting a cold is to bundle up.
* bundle up: dressed warmly; as, bundled-up sailors and soldiers. 따뜻하게 껴입다.
ex> You should bundle up if you want to play in the snow.

We should try to get some fresh air as often as possible in the winter.

Our joints tend to get stiffer, making us more prone to injury.
ex> My neck gets stiffer in the evening.

You must eat healthy foods and stay as active as you can.
ex> I've been trying to stay active by playing various sports.

@ We're going to need some back-up.  우리 지원이 조금 필요할 거야.
cf> back me up. = help me out.