Wait, I found the information!
http://www.ananova.com/news/story/sm_758192.html
Twiggy wears a red lifejacket and a pair of skis and is pulled around a 24ft pool that is just six inches deep, reports the Washington Post.
"It's kinda like training a husband," [Twiggy's trainer] says. "You have to give them a lot of love and affection and tell them the same thing over and over again."
I guess.