That's a good shot. I've seen a bunch of photos like that and still think it's cool when they show somebody at that exact moment when their legs are straight, arms at their sides and totally relaxed so it looks like they're just floating there.
Funny thing is, I was watching that very race in person and saw some of them bounce up and down off their toes with straight legs like that and it never occurred to me that a still shot might make it look like they were floating. It might be one of those lucky pictures you can only shoot without really trying to do it.