[kwhitefoot]

I think this part is the central point:

   "for example in the context of physical activity promotion, which they can basically master with the help of their competencies "

I vaguely remember reading about a study of kindergarten (barnehage) children in Sweden. It found that children who attended inner city kindergartens had poorer coordination, self confidence, and socialisation than those who attended rural kindergartens. The principal difference between the two type of kindergarten was that the inner city ones had paved playgrounds while the rural ones had grass, mud, puddles, and trees. The rural children suffered more frequent minor cuts and grazes but were less likely to be put off playing outside.

This agrees with my personal experience of having three children attend kindergarten in a very small town in Norway. At the end of the winter the playground looked like the Somme but the children (both boys and girls) were still playing in it; thundering around on trikes, climbing, and falling off, various bits of equipment, having the time of their lives.