YOU SAID:

My bottom hurts because I worked out for a long time yesterday

INTO JAPANESE

私は昨日長い間働いたので、私の底が痛い

BACK INTO ENGLISH

My bottom hurts because I worked long yesterday

INTO JAPANESE

私は昨日長く働いたので、私の底が痛い

BACK INTO ENGLISH

My bottom hurts because I worked long yesterday