“…However, this period overlaps the beginning of education [ 1 , 3 , 7 , 9 , 10 ]. An active preschooler turns into a student who leads a sedentary lifestyle and spends a lot of time at school, at a desk, in front of a computer monitor, instead of engaging in outdoor PA. All of those factors contribute to the emergence of overweight and obesity, which in turn cause serious posture defects in children [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 33 ]. The conducted body composition studies allowed for the assessment of the symmetry of the distribution of fat and lean mass in early school-age children.…”