Just count to three and do it! It's like jumping into a cold pool.

数着一、二、三，然后去做，就像跳进冰冷的水池一样。

youdao

She signalled for him to wait, and when she entered the bedroom the air-conditioned atmosphere made her shiver as though she had just stepped into a pool of cold water.

NEWYORKER: Alone

It was colder than ever now, but the sky had cleared, and a bright moon had emerged from the clouds, cold and white in a pool of indigo sky right above the garden.

NEWYORKER: The Cold Outside

There simply isn't enough evidence to justify the benefits of swimming in freezing cold water over some laps in a warmer swimming pool.

CNN: Are polar bear plunges good for you?