You knew your wife had a personal trainer... but you had NO IDEA they were doing THAT for cardio. Today she wants to watch, because you're just going to have to get used to it. After all, YOU are the one paying for her personal trainer. She is now infatuated with his big muscles, toned body, and long dick. Your flabby stomach and short cock aren't going to cut it any more. She is fucking him for cardio and for pleasure now while you watch and learn!