Clearly he's not 100% but he has admitted that and that in a way it could be part mental as he obsesses over it. On the other hand, we don't know for sure when that was filmed during practice. If that was filmed at the tail end of a grueling, 3 hour practice, then I might think he looked pretty good, all things considered.
My guess is it probably was shot towards the end of practice as the media only gets to see about 15 minutes of practice and it is logical to think they are allowed in at the end. KG could conceivably be running real well on it for 2 1/2 hours and then had it start to get sore after long day. It is possible.