<p>Over the last few years, the number of publications regarding genetics and sports has notably increased. However, the way this information is actually used is often misinterpreted by those who do not apply genetics in their day-to-day training. Therefore, the purpose of this short communication is to exemplify, using the real cases of identical twin athletes, how genetic information must be applied in sports. Additionally, we present data on performance tests and individual preferences for training and competitions between the athletes. Accordingly, the study concludes with a distinction between genetic profile studies and genetic application studies, emphasizing the importance of further research in this area, especially case reports.</p>