Actually I do have the Amped workout. Yes I think that it is a great workout. And yes it does help lose weight. I love Billy Blanks and I buy every workout that he comes out with I lost 53 pounds...
If I was in your place I would sit her down and tell her that you do not want to hurt her. But you would be by letting the marriage go on. If you feel that you may go out on her that is not the best...
I would email her back and tell her no thanks and just make sure that you left the house hours before you knew that she would be there and maybe not return until the next day.