Group view with all subgroups contacts

Have a view of the group with all subgroups included, perhaps with a separate checkbox "include subgroups". Example: I have a group "Sport", which includes "Swim", "Bike" and "Run" Subgroups. When I click Sport group i want to see all people doing any sport. Current logic of a parent group displaying only people at the tree node but not a subtree, feels unintuitive.