Condon was rendered a paraplegic after contracting childhood polio. Condon was the only New Zealander to take part in six consecutive Paralympics. He competed in the Paralympics in athletics and swimming at both the 1968 Tel Aviv and 1972 Heidelberg Games, and won a gold medal in the Men's Discus 3 event at the latter competition. He participated in the 1976 Toronto Paralympics and won a gold medal in the Men's Discus 2 event and a silver medal in the Men's Slalom 2 event at the 1980 Arnhem Games; he also participated in swimming at the 1980 games. At the &lt;a href="1984%20Summer%20Paralympics"&gt;1984 New York/Stoke Mandeville Games&lt;/a&gt;, he won two bronze medals in the Men's Marathon 2 and Men's Slalom 2 events. During the Marathon, he was with a bloc of competitors from Australia, America, and Canada when he hit a pothole around the mark, causing the competitor behind him, Robert McIntyre, to lose his balance and flip upside down. Condon helped McIntyre back into position and ended up coming third. His final Paralympics were the 1988 Seoul Games, where he won a silver medal in the Men's Slalom 2 event. He won a total of seven Paralympic medals and 36 medals in international competitions throughout his career.