Half Ironman 70.3 Poznań, where endurance meets the spirit of Poznań in a triumphant fusion of nature, speed, and history. Swim in the pristine waters of Lake Kierskie. A rolling start format ensuring a smooth beginning to your race. The lake's embrace promises a unique start to your Half Ironman journey, with an average water temperature of 65°F / 18°C adding to the perfect racing conditions. Once out of the water, gear up for the 90km bike leg, a thrilling ride that takes you through the ...