Answer:
about 6 years old
Step-by-step explanation:
As with the given information it is clear that kindergarten children or a little above then them are not that physically active.
More than being physically active, they are too young to follow any specific norms. When there are organised sports it refers to certain rules to be followed.
Further they are too small in their age to run a marathon which might be as small as 1 km. Or simply the children of that age may be just want to relax and enjoy rather than physically getting involved in a sports activity which requires so many efforts..