I said " я була у фітнес-залі."
same and it was marked "incorrect"!
Is it ok to put уранці at the end?
Definitely. I hope it is accepted here...
Yes, it's ok. Ukrainian language doesn't have strict order of words in sentences.
You can say:
1. Я вранці був У ЗАЛІ.
2. У ЗАЛІ я був ВРАНЦІ.
It depends on what do you want to emphasize.
what is the random use of the hyphen about here? Are фітнес-залі and фітнес-зал hyphenated words or not?