I found this pretty amazing. Well, except for the part where she gets the horse going a million miles an hour then screeches it to a halt-that part made me cringe. But the rest of it, wow, even if you don't ride horses surely you can appreciate how difficult that must be to train.
If you watch it on the actual YouTube site there are some other videos available including some footage of her on the Ellen Degeneres show where she explains that she spent 2 years training, an hour a days five days a week, just to get to the point where she could ride the horse with no saddle or bridle then another year to be ready for competition. Makes my running contact practice seem ridiculous by comparison.