Introduction: Although several genetic variations have been associated with athletic profiles and athletic performance, there is little scientific literature on the incorporation of this information into the planning of daily training, especially in elite athletes. The aim of this study is to present our one-year training experience with a high-performing open water marathon swimmer, integrating insights from genetic information. Materials & Methods: This is a case study conducted with a 23-year-old open water marathon swimmer aiming to qualify for the Absolute World Championships in Doha, Qatar (2024). The study involves the use of twenty genetic polymorphisms to structure the athlete's training plan. Results: Training based on genetic polymorphisms proved to be effective in enhancing the athlete's athletic performance, securing his top position among compatriots, and qualifying him for the Absolute World Championships. Conclusions: Genetic-based training may be an effective strategy to assist sports professionals in making training planning decisions for high performance athletes.
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