In rude health
Definition 1 of 1
Pro Tip 1/3Positive Connotation
The phrase 'in rude health' suggests someone is exceptionally well and implies positivity and strength. 
Even after a strenuous hike, he appeared in rude health.
Pro Tip 2/3Informal Usage
'In rude health' is casual and typically used in informal conversations or personal writing. 
At the family reunion, Grandma was clearly in rude health.
Pro Tip 3/3Not Literal
Sometimes used figuratively to describe things that are thriving, not just about people's health. 
The garden was in rude health, with all flowers blooming brightly.