 Jahrling's senior club rowing was done from Sydney Rowing Club, where he is an Honorary Life Member.He was first selected to represent New South Wales in the 1993 men's senior eight contesting the King's Cup at the Interstate Regatta within the Australian Rowing Championships.He raced in further King's Cup eights for New South Wales in 1994, 1995, 1998, 2000, 2002 and 2004.