YOU SAID:

Tomorrow's my gym day so I'd better wake up early

INTO JAPANESE

明日は私のジムの日ですので、早起きした方がいいです

BACK INTO ENGLISH

Tomorrow is my gym day, so you should get up early

INTO JAPANESE

明日は私のジムの日ですので、早起きしてください

BACK INTO ENGLISH

Tomorrow is my gym day, so get up early

INTO JAPANESE

明日は体育の日なので、早起き

BACK INTO ENGLISH

Tomorrow is a day of physical education, so get up early

INTO JAPANESE

明日は体育の日なので、早起き

BACK INTO ENGLISH

Tomorrow is a day of physical education, so get up early