We studied the effects of physical activity on the dynamics of speed development on the sample of 530 boys aged 12-16. Of this number, 110 trained judo in various judo clubs throughout the Serbian province of Vojvodina, while the other 420 were sedentary boys from four major towns in the province. The study was conducted as a part of the Faculty of Sport and Physical Education project entitled 'Anthropological status of the residents of Vojvodina'. A single motor skills assessment was performed across all ages: the 20-m run. The results suggest that there is a steady development of speed with age in either group. The oldest participants showed the best performance, confirming that speed appears to develop progressively until 18 years of age or so.
