According to the conversation, which type of athlete is Rudolf Navitsky characterized as?

Rudolf Navitsky is characterized as a gymnast based on the context of the conversation. This is evident from mentions of his specific training routines, focus on flexibility, strength, and precision, which are hallmark attributes of gymnastics. The emphasis on balance and agility further reinforces his identification as a gymnast, as these elements are integral to the sport. Other types of athletes, such as football players, basketball players, or swimmers, typically engage in different kinds of training regimens that do not reflect the specific qualities highlighted in the conversation surrounding Rudolf.