olsson, Manificat, Hellner, Northug, Cologna

http://www.youtube.com/watch?v=Kd-Bb5RuCRg

What's up with Peter Northug ?
Is he actually achieving to push backward instead of sideway ?

For the overwhelming majority of us, trying to push backward induces hips rotation and has negative effects. This is generally a wrong catch from too much inline rollerskate.