I just finished reading Marriage Fitness as well and definitely recommend it. Although I have no idea if I'll ever get a chance to apply to my own marriage : / it still feels fulfilling continuing to learn more about good relationship skills. The book pairs well with DR or DB I think.
There's a great part of the book that talks about finding someone new vs. staying in a rough marriage... and as so many of us on here know, many WAS are searching for a more suitable partner. The book says "If you bought a Dell computer and couldn't figure out how to work it, would you throw it away to buy an IBM? If you don't know how to work a computer, changing brands isn't going to help." Cute analogy to fixing a marriage or trading it in for a new one. The book also has great tips on 'giving' to your marriage and moving from me to we. Perhaps you could get two copies, one for you and one for H, and both commit to trying the techniques. Good luck! Hope you have a great time in the cabin.
