Physical Activity Levels During Physical Education Classes and Their Impact on Physical Fitness in 10-Year-Old School Children: A Comparative Study.

: The aim of this research was to determine the differences in physical fitness according to the level of physical activity (PA) during physical education classes in 10-year-old school children. : The research included 315 primary school children (age 10 ± 1.3 years), divided into three groups by level of PA: low, moderate and high.