Isn't average walking speed about 4-5 km/h? Don't forget, this is just walking, not running. They went from a walking speed of about 3.8 km/h to 4.1 km/h, still a bit on the low side.  What's appalling is that they gave them surgery to do this!  What ever happened to eating like a human being and exercising?! What we need is more of this: http://www.theglobeandmail.com/life/life-video/video-ctv-toronto-healthy-school-gets-kids-moving/article30479519/