Introduction: Majority of children are unable to meet the recommended 60min of daily moderate to vigorous physical activity (MVPA). Even participation into organized sport may not guarantee that recommended amount of activity is reached.

Objectives: Purpose of this study was to examine the amount and intensity of physical activity (PA) on days with and without practices and to find out whether daytime PA preceding soccer practice is associated with certain practice-time PA intensity level.

Methods: Daily light, moderate and vigorous PA of 18 boys between 12 and 13 years of age engaged in soccer was measured for 9 days with and without soccer practices with wrist-worn Polar A300 activity meter. In addition, PA during practices was extracted and compared to PA preceding the practice session.

Results: The daily MVPA was twice as high on days with training as compared to days without training both on weekdays (mean difference ± 95% confidence interval = 67 min ± 14 min) and on weekend (63 min ± 36 min). PA preceding soccer practice had a positive correlation with all PA intensity levels during practice (r = 0.34–0.84, p < 0.05–0.01).

Conclusion: Physical activity should be promoted especially on days without organized practices and children should be encouraged to be physically active throughout the day as this was not found to compromise their activity during training.