Elle and Brooke's fitness guru reveals how she helps them keep their gorgeous bodies in shape. Ever wondered how fabulous 40-something mums Elle Macpherson and Brooke Shields stay that way? They've both been trained by former dancer-turned-celebrity fitness guru, Karen Voight. When Elle was working on her fitness video Your Personal Best, she asked Karen to star in it with her. So just how did Karen manage to improve on The Body?