Pupils learn the recorder, keyboard and basic music theory. Singing is an important feature in all junior classes. In addition, private tuition is available if desired in guitar, clarinet, flute and singing. The school has celebrated successful results each year in the Guildhall Examinations in respect of the above. It is a very strong activity at Marymount with teams and individuals competing in schools' competitions at regional and national levels.
General classes involve ball handling skills, and use of varied equipment.
A firm favourite with children and parents alike, is the annual Sport's Day. With the recent reintroduction of boys to the school, new activities of football and beginners cricket are being re-established for boys and girls. The upper junior pupils participate in the netball club which meets after school from 3.30 to 4.30 pm. Pupils enjoy these additional practice sessions and improve their skills for participation in competitions. The gymnastics club operates during lunch time breaks and after school.