Dear native English speakers, would you help me?
I'd like to _____ in (good) shape.
Which word(s) would be appropriate in the blank, be, stay, keep, get, or become ?
'keep' and 'get' sound slightly off to me, perhaps not wrong, just not something that is usually said.
be, stay and become are certainly fine.
All of them sound somewhat like they come from a textbook, but I think they could happen in a polite conversation.