Rennex's senior club rowing was from the Australian National University Boat Club.
Rennex first made New South Wales state representation in 1983 in the lightweight four which contested the Victoria Cup at the Interstate Regatta within the Australian Rowing Championships.[1] She raced that event again in 1985 when she stroked the New South Wales four.[2]
In ANU colours she contested national championship events at the Australian Rowing Championships. She stroked a composite Australian Capital Territory eight competing for the open women's eight title in 1982.[3] In 1983 she was in the two seat of a composite eight comprising the New South Wales state selected lightweight plus heavyweight women's fours.[4] In 1985 she rowed in a composite eight containing the New South Wales lightweight four in the bow end and the Victorian lightweight four in the stern. They were unable to beat a heavyweight Melbourne University eight to the championship title.[5]
Rennex was the Australian National University's single sculling entrant at the 1982 Australian Intervarsity Championships.[6] In 1983 she won the coxless pair university title at the Intervarsity Championships.[7]
