In reply to Moley:
I really struggle with this. Impressive speed and something I could only dream of with both feet off the ground. But the thing is, his are. And all the other race walkers. The BBC clearly made an editorial decision to focus on the top half of the walkers because it's very easy to spot them lifting. The whole sport relies on allowing a limited number of infractions visible to the 'naked eye'. Too judgement-based, too fiddly for me.
Or as my eldest said: 'that's just running weirdly!'