Ключевые слова: 4x400, athlete, athletes, athletic, athletics, balkan, balkan athletics indoor championships, balkan indoor championships, baton, boy, challenge, championships, competition, event, exercise, fitness, healthy, istanbul, jogging, male, man, men, race, relay race, run, runner, running, sport, sports, sporty, sprinter, sprinting, track, track and field, training, turkey, wellness, workout,