second wind vs get-up-and-go

second wind and get-up-and-go both are nouns.

Word	Noun	Adjective	Verb	Adverb
second wind	Yes	No	No	No
get-up-and-go	Yes	No	No	No

As nouns, get-up-and-go is a hypernym of second wind; that is, get-up-and-go is a word with a broader meaning than second wind:

Other hypernyms of second wind include energy, push.

second wind (noun)	get-up-and-go (noun)
the return of relatively easy breathing after initial exhaustion during continuous exertion	enterprising or ambitious drive
renewed energy or strength to continue an undertaking