I agree that it should not matter if it is structure verses unstructured as long as they are actually BEING active ... I think the push for the 'structure' is that because more and more children while 'outside' are SITTING instead of being active ... if you look at a school playground for example they may be outside for 'recess' but dozens of them are all sitting around playing handheld video games so if that 'unstructured time' is ALL they are getting in their allotment of physical activity in the school day there is no way they are meeting the requirement hence the rise in 'obesity' in our country!

Weather permitting we are outside engaged in 'active play' at least 60 minutes a day at the park climbing, running, sliding and using our body big, we are engaged in 60 minutes of 'outdoor play' in the backyard however it is not as 'active' because the space is smaller and I have sensory bins and other motor activity options in the yard as a focus .... in addition to this time because I do have kids who will go to the park and 'sit' under neath and play with the sand verses being 'active' so I also do a 30 minute 'gross motor group time' with the kids in the morning where we play the games like Sleeping Bunnies, Head and Shoulders, Zoom Zoom Zoom going to the moon, Hokey Pokey we play games like What time is it Mr Wolf or Duck Duck goose or we bring out the parachute for games and other things to get their heart rates AND MINE up for a consistent 30 minutes in the day.