Clark won eight New Zealand national weightlifting titles: four in the light heavyweight division, in consecutive years from 1947 to 1950; three in the middle heavyweight division, in 1951, 1952, and 1953; and the middleweight division in 1939.[1] He represented New Zealand in the light heavyweight division of the weightlifting at the 1950 British Empire Games in Auckland, where he finished in fourth place, recording a total of 730 lb (331.1 kg). At the 1954 British Empire and Commonwealth Games in Vancouver, he moved up a weight class, to the middle heavyweight division, and finished fifth, with a combined total of 790 lb (358.3 kg).[2][3]