Bieg Juniora is a children's running event in Białystok. The youngest runners compete over 100 metres, while older children move up through 400 metres, 600 metres, and 1 kilometre. This event is part of the Super Biegacz series and is designed for children, not for adults focused on times. Distances are assigned by age, catering to toddlers aged 2-4 up to runners aged 11-14.
The race is organised in small starting groups departing every few minutes, making the day manageable for young children and their families. A 600-metre wheelchair race is also available for children with disabilities, with no age limit. The event is non-competitive, emphasizing activity and enjoyment, and every child receives a commemorative medal upon finishing. Race numbers are collected at Plac Marszałka Józefa Piłsudskiego, the square in front of the Dramatic Theatre; a number is required to run.