Suppose Mr. Zhang just got an forced-quarantine order and he says
"I don't need any quarantine, I am quite healthy" src
... "I am in quite good health" src
... "I have quite good health" src
... "I'm having quite good health"
Google Ngram verifies some of the uses above.
Do native speakers say it that way?
Are they grammatically correct? Do they mean the same thing? Thanks in advance.