Jim Day joined the Canadian national equestrian team in 1964 and, four years later, was a gold medalist at the Olympics, having won the team event at the 1968 Games alongside Jim Elder and Tom Gayford. He also finished joint-13th individually. Just one year prior he had been the individual gold medalist at the 1967 Pan American Games, as well as a bronze medalist in the team event with Elder and Gayford. His next stop was the 1970 World Championships, where he again won gold with Elder and Gayford, but he was absent from Elder and Gayford’s victory at the 1971 Pan American Games, replaced by Torchy Millar and the non-Olympian Barbara Simpson. He joined Elder, Torchy, and Ian Millar at the 1972 Summer Olympics, where they finished sixth in the team competition and Day was joint-fourth individually. His final major international tournament was the 1976 Summer Olympics, where he was fifth in the team event with Elder, Ian Millar, and [Michel Vaillancourt] and joint-15th individually. He also competed in the three-day event, placing sixth in the team competition with Juliet Graham, Robin Hahn, and Cathy Wedge. After retiring from active competition in 1977, he took up horse training. He has been inducted into Canada’s Sports (1968) and the Canadian Olympic (1971) Halls of Fame.