YOU SAID:

I told my friend i'm at the gym but i'm doing this...

INTO JAPANESE

私は私のジムにいる私の友人に言ったが、私はこれをやっている...

BACK INTO ENGLISH

I told my friend in my gym, but I am doing this ...

INTO JAPANESE

私は私のジムで友達に話しましたが、私はこれをやっています...

BACK INTO ENGLISH

I told my friend at my gym, but I am doing this ...

INTO JAPANESE

私は私のジムで友達に言ったが、私はこれをやっている...

BACK INTO ENGLISH

I told my friends at my gym, but I am doing this ...

INTO JAPANESE

私は私のジムで友達に言ったが、私はこれをやっている...

BACK INTO ENGLISH

I told my friends at my gym, but I am doing this ...