YOU SAID:

dont eat if you dont exercise

INTO JAPANESE

行使しない場合を食べない

BACK INTO ENGLISH

Do not eat if you do not exercise

INTO JAPANESE

運動しない場合を食べていません。

BACK INTO ENGLISH

I do not eat when I do not exercise.

INTO JAPANESE

私は行使しないときとは食べない。

BACK INTO ENGLISH

I do not eat when I do not exercise.