Phil Weaver, the author, is the co-creator of the kung fu based aerobics video, Cardio Karaticise. He is also a full time Kung Fu instructor. He and His wife Liz Weaver operate a Kung Fu school in Burson Ca, which teaches authentic Mandarin Kung Fu called Shou' Shu',
They offer free lessons on how to properly do martial arts based aerobics program, while minimizing the risk of injury at their website http://www.karaticise.com/