The COVID-19 pandemic, which emerged in early 2020, caused widespread disruptions to youth sport, including curriculum-based physical activity, organized sports, and active transportation. This study investigated the impact of repeated lockdowns on organized youth sport participation, physical fitness, skill development, and psychosocial well-being in Slovenia. An online survey was conducted between November and December 2021 with 116 coaches of U13–U19 athletes across multiple sports disciplines. Descriptive statistics and non-parametric analyses were employed to examine participation trends, training adaptations, and perceived athlete outcomes. Following the first lockdown, 14.6% of athletes dropped out, while 6.5% of teams reported increased membership. After the summer break, participation rebounded, and the second lockdown had a smaller impact, indicating partial resilience in youth sport engagement. Training frequency and modality were substantially affected, with 20% of coaches not implementing remote sessions and fewer than half conducting post-lockdown fitness assessments. Coaches reported declines in general physical fitness (71%) and sport-specific skills (70%), heterogeneous changes in body mass, and reduced self-confidence and motivation in over 50% of athletes, whereas team spirit remained relatively stable. A significant association between perceived changes in body mass and motivation highlighted the role of physical self-concept in supporting engagement. These findings demonstrate that prolonged interruptions to organized youth sport have multidimensional effects on physical, technical, and psychosocial development. Future research should explore long-term consequences, identify effective mitigation strategies, and consider sport-specific, age, and gender-related factors to enhance resilience in youth sports systems under exceptional circumstances.

Although sedentary behavior (SB) is still an under-researched area, some studies have shown a significant association between prolonged sitting and an increased risk of mortality, due to various causes, independent of physical activity. Despite the health risks, there are currently no specific guidelines for individuals to self-assess their SB. A pilot observational study was conducted as part of the »Knowledge for Health« event. A short online quiz “Sedentary meter” was developed, consisting of a pictorial scale to help event participants assess their daily sedentary time and to promote a better understanding of the associated health risks. The quiz questions were formulated based on the WHO definition of SB. The participants’ task was to subjectively estimate the amount of sedentary time in various types of SB on a typical day. The results obtained for SB could then be immediately compared with the figurative scale based on the WHO guidelines. The analysis confirmed SB (533.0±224.7 min/day) in all age groups, although possible differences according to the type of SB were noted. Despite statistically non-significant differences, those between age groups may indicate the extent to which SB can be individualized. The differences between age groups may indicate the importance of considering SB which can be targeted based on each age group's daily routine. The simple tool for accessing SB raised awareness of which specific type of SB accounts for the majority of participants' daily sedentary time. The self-critical acceptance of the “poor results” across all age groups shows the effectiveness of the initiative in raising awareness of SB issues.