Home / Galleries Clothing Lieutenant Colonel Iain Addinell of the Australian Defence Triathlon Association competes in the 70.3 Canberra Ironman event. *** Local Caption *** IRONMAN 70.3 Canberra takes athletes through the city on one of the most scenically diverse courses on the Ironman circuit. Over 1000 competitors swam a 1.9km, one-loop course in Lake Burley Griffin. The 90km bike course took athletes along the shores of Lake Burley Griffin and Canberra’s highways, urban and rural roads. The event finished with a 21.1km, two-loop run course through parks and landmarks such as the National Museum of Australia and Australian National University.