Train Smart for the Half Distance Triathlon Belgrade, Serbia — Built for Masters Athletes 40+ With its calm 1,900-meter swim in Sava Lake, fast and scenic 90-km bike course, and inspiring run past historic landmarks like Belgrade Fortress and the Belgrade Waterfront, this race promises an unforgettable challenge. Our 36-Week Half Distance Triathlon Training Plan is purpose-built for competitive athletes over 40—providing a proven path to peak performance, whether you’re moving up from shorter ...