IPA: //dʒɪmˈneɪziəm//
KK: /dʒɪmˈneɪziəm/
A building or room designed for indoor sports and physical activities, often equipped with various sports equipment and facilities.
The students practiced basketball in the gymnasium after school.
Gymnasium → It is formed from "gymnasion" (Greek, meaning a place for physical exercise) and the suffix "-ium" (indicating a place). The word "gymnasium" refers to a place designed for physical training and exercise.
Think of a 'place for exercise' in Greek ('gymnasion') — that's why a gymnasium is where you go to work out.