In the pink 这个短语可以用来形容某人身体非常健康。

例句
I've had a rough few months, but I'm happy to say that I'm back in the pink again.
She's 87 but she's still in the pink!
Our profits are down on last year's but we're optimistic that by year-end we'll be in the pink again.

请注意
Tickled pink 意思是感觉非常荣幸或高兴。

例句
He was tickled pink to be chosen to meet the company president.
Thanks so much for sending the flowers – I was tickled pink!

相关知识
The colour pink is increasingly associated with girls in the UK. Over the last 10 -15 years, more and more children's toys and clothes are segregated into the 'gender-specific' colours of pink and blue. There are different theories about why this might be happening. There is also a campaign to stop the trend; a group has been set up which opposes what they call the "pinkification of girlhood". It is called Pink Stinks.
在英国，人们逐渐多的把粉红色和女孩子联系在一起。在过去的 10 至 15 年间 ，越来越多的儿童玩具和服装为了针对不同性别被分成了粉红色和蓝色来。对此现象的发生有很多不同的理论说法。同时也有不少人提出抗议，反对以粉红色作为女性的象征，这个反对组织的名字叫 “Pink Stinks 粉红色臭臭”。