Hatzis got his start as a coach at university and founded a training camp business after graduation. This business rapidly expanded into a coaching platform and now his Tri Training Harder platform serves both athletes and coaches with coaching and educational services.
He coaches high-level triathletes to prepare them for ITU and IRONMAN racing and has more recently coached marathoners and ultramarathoners. Hatzis is known for his coaching of longer distance races. Most of Hatzis’s athletes are developed within the Tri Training Harder system rather than recruited.
Hatzis contributes to BIKE magazine, 220 Triathlon, TrainingPeaks, and IRONMAN University.