That horse's rear fetlocks (ankle-like bits) don't seem too healthy. They appear to go too far down as the horse walks. 1:10 - they're not supposed to be near the ground like that. Interesting video and I enjoyed watching it. The horses looked well cared for.
I noticed that too - They’re definitely low. I think this horse is probably on the older side, so that may be why. DSLD maybe? The horses look very well cared for though, so I’m sure they get appropriate vet care.