To be back in the pink

In the pink (of condition) and in the pink (of health)
Syn:  in very good health; in very good condition, physically and emotionally. (*Typically: be ~; get [into] ~.) 

• It was almost a miracle that after his bout with pneumonia, he was back in the pink of health. - en pleine forme
• He recovered completely from his surgery and has been in the pink ever since. 
• She was lively and active and in the pink of condition.

In the pink (of something)

Syn: very strong and operating well 

• Our business is in the pink these days. - dans le vert

 

Interestingly, "in the pink" can be translated by "dans le vert" in French...maybe a cultural difference in the way of feeling the colors!