YOU SAID:

If I went to the gym, I would be a lot more fit.

INTO JAPANESE

私はジムに行って、私はより多くのフィットになります。

BACK INTO ENGLISH

I went to the gym, I'll be more fit.

INTO JAPANESE

私はジムに行ってよりフィットをするよ。

BACK INTO ENGLISH

I went to the gym, the more fit you.

INTO JAPANESE

私はジムに行ってよりフィットします。

BACK INTO ENGLISH

I went to the gym, better fit.

INTO JAPANESE

私ジムに行ってより良いフィット。

BACK INTO ENGLISH

I went to the gym, better fit.