Chances are, if you read this blog, you've already seen this... because at last check well over
If somehow you've missed it, take a gander; it makes so much common sense, of the sort we often look right passed, with lots of suggestions (and lots of interesting comments as well):
This morning, I noticed someone on Twitter responding to the post by mentioning that they knew a couple of classrooms where regular school seats were replaced with ball chairs -- I thought that was a fascinating idea, even if not always practical -- just an example of the simple (and perhaps healthier?) outside-the-box thinking the article encourages.
By the way, Grant promises that the writer will be doing a follow-up to the piece.
ADDENDUM: Michel Reed, the teacher who mentioned the above ball chairs example, later tweeted this photo of such a classroom :-):