Originally Posted by StormyBlues
I'd put some of that to the fact that this rider has a really nice, stable position too. REally, when you look at a rider, the upper body shouldn't be moving much because the lower body is absorbing the shock of the gallop (because you're up in galloping position)
I do not disagree, this rider I am sure has a wonderful position.
In some places during the video you can see his shadow. You can see his upper body moving. That is not represented in the video. So, though I agree the rider has a good position, this camera set up must have some sort of system to accommodate the bounce and movement of riding and still provide a smooth video. Notice it was not even jumpy when he dismounted.