Join us for the rebirth of the ET Lake Zurich Triathlon on Sunday, July 13, 2025 from Paulus Park in Lake Zurich! The Olympic Triathlon is a 1500 meter swim, 40K bike and 10K run. The Sprint Triathlon is a 750 meter swim, 22K bike and 5K run. The Duathlon is a 5k run, a 40K bike and a 5k run.