“…Recent research indicates that, over recent decades, children are left with less opportunities for free play, especially outdoors (e.g., [ 6 , 7 , 8 , 9 , 10 ]). Children’s spend more time indoor in sedentary activities, and less time in outdoor play and vigorous physical activity [ 11 ]. Similarly, research on outdoor play indicate that children rarely get opportunities to learn and master risk on their own account [ 9 , 12 , 13 , 14 , 15 , 16 ].…”