Please look at the following sentence.

"Therefore, you gym membership should serve your purpose of staying fit"

I don't know the meaning of "fit" there even though having looked it through my dictionary.
Could you explain to me what "fit" means?

Thank you for your answer in advance.
In this context, fit means to be physically healthy, to exercise regularly enough that you look and feel healthy and you have the strength to do your daily activities or to participate in sports.

I don’t know