seems too big wrote:
A minute and a half seems an awful big difference. I know kids have more indoor activities to choose from today and are probably less fit on average than in the past. Still, sports are just as popular now and I don't recall there being kids running around on soccer fields as much in the past like in the 80's now they are just everywhere. All in all a minute and half just seems way too big a difference.
Beyond the average time, it would be interesting to see the change in distribution (or standard deviation) over the years. My guess is that the "active kids" you see playing soccer and such are essentially as fit as ever, but there are ever more "inactive kids" that are dragging down the curve. This would be consistent with the general increase in overweight kids and adults we've seen with each successive generation.