Pain served as president of the Taranaki Jockey Club between 1975 and 1978. He was chef d'équipe, or manager, of the New Zealand eventing team at the 1988 and 1992 Summer Olympics, and the 1986 Eventing World Championships and 1990 World Equestrian Games. At those competitions, the New Zealand team won a total of seven medals, including one individual and two team eventing gold medals.