LONDON, England -- Ann Romney, wife of presumptive Republican presidential nominee Mitt Romney, has a vested interest in the Olympics.  It's much more than just the fact that her husband is attending the Opening Ceremony or that he helped organize the 2002 games.

She actually is co-owner of a horse, Rafalca, competing in dressage, one of the equestrian events at the 2012 games in London.

Ann Romney says watching her horse can be "nerve-wracking."

"When I'm watching my horse, it's like watching my children play sports...I know every move she makes. I know where she makes mistakes. I know where her weakness are. I know where she may lose confidence of the rider a little bit," Ann said in an interview on NBC's The Today Show Friday, when asked what's harder between her husband competing for president or a horse in the Olympics.

So what is dressage? There are three disciplines in the equestrian competition -- dressage, eventing and jumping, with 200 contenders vying for only six medals.