[3] She showed early promise as a sprinter as a 13-year-old, finishing third in a 100 yards invitational handicap race at Morrinsville in March 1939, behind the Australian, Decima Norman, who equalled the world record, and Doreen Lumley.
[4] In 1940, Hart won the junior girls' athletics championship at Hamilton Technical High School, breaking records for the triple jump, long jump and the 100 yards, recording a time of 12 seconds for the latter event.
[2] In 1942, Hart recorded a time of 11.6 seconds in winning the girls' senior 100 yards representing Hamilton Technical High at the Waikato Secondary Schools' athletics meet.
[11] At the 1950 New Zealand athletics championships, Hart set a new national record of 24.9 seconds in her heat of the 220 yards.
[13] Hart, Parker and Rowe all represented New Zealand in the women's 220 yards at the 1950 British Empire Games in Auckland.