Expressing your state of health and happiness (выражая свое состояние здоровья и счастья)

Fine.
I’m fine.
I’m cool, (slang)
Keeping cool.
Dandy. (informal)
Fine and dandy.
Great.
Couldn’t be better.
Happy as a clam. (cliche)
Okay.
All right.
(I) can’t complain.
No complaints.
I have nothing to complain about.