Experience what other triathletes are talking about! Swim in the clear, spring-fed waters of Lake Jackson. Ride on the smooth, fast bike course on the open roads north of Sebring. Run the historic downtown Sebring Circle Park to the finish line! Celebrate your finish with your friends and family at one of the best food and beverage spreads seen in our sport. The Heartland Triathlon is an event created by triathletes for triathletes and their families. Sprint, Olympic and Youth Races.