Szukana fraza: [Abstract = "The article aims to assess changes in the physical development and fitness in boys from central\-eastern Poland. The studies were conducted in 2015 and 2016 and involved 4995 boys aged 7\-18. The obtained data were compared with the results of the studies con\-ducted in 1985 and 1986 and with national averages. On the basis of the comparison, the authors revealed the secular trend in body height by 5.26 cm \(1.88 cm per decade\) and in body mass by 6.36 kg \(2.12 kg per decade\), and a significant decrease in the level of motor skills \(the International Physical Fitness Test\). The authors worry about the observable decrease in physical fitness, especially in the youngest age groups \(ages 7\-13\), and its deterioration compared to other peers in various regions of Poland."]

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