OK I see a trend here....So your wife has lost 100lbs. over a course of time and is feeling sexy about herself.
I am glad you are trying to get into shape and you should pursue that as well.
Advice, I also workout and eat healthy (to a point, love buffalo wings) I lost some wait and my body has developed very nicely where I have women hitting on me now.
OK since you can not go to the same gym, well is there another gym you can become member of? Or do your own Personal training? I have a gym at work I can use for free
I bought the Book "New Rules of Lifting" and have been following that for over a year now, I love it. My wife thought about joining a gym, but instead I train her now, work out with her at home and even building my own personal gym at home to use. So we can do it together.
How about you ask her for advice? Working out advice that you want to get in shape, maybe she can be Your personal trainer, maybe you should encourage her to go for certification?
Buy healthier meals, and eat healthier together, good solid dinners and meals together, show her you want to make the effort and give her your best effort.
As for the cruise.....Book it for yourselves. Just you and your wife ONLY Find a cruise you would both enjoy.
I also recommend, finding out your wife's dress size now. Buy her some sexy dress's (not crazy now) but Victoria secrect sell's some nice dress's on line, I Often buy my wife clothes that I think she would look sexy in. Matter of fact I buy to much for her...yea weird I know, But I think My wife is smoking HOT!!
Slap her tush (gently) when she walks by you in the house, steal a kiss, do what ever it takes for body contact. Wink at her, flirt with her. Play games with her, tease her.
I know for a fact that she probably wants you in better shape, is her personal trainer a male or female? I know after I got in better shape, I was more critical of my wife's body, just natural I suppose. I takes a long time for results and good eating habits.
I say take a heavier interest in working out and eating healthier, talk to her about getting you in shape. My goal is to be in Better shape at 40 then I was at 20. (already there) .
Also work in your other interest, Motorcycle rides to fun places.
But now that you say she has lost a 100lbs....well you need to join her in working out (not together) or face the fact you may lose her.....because other men are taking interest in her and she likes the attention she is getting now.
Love is an odd thing...you need to rekindle that spark, and she made a life changing decision (working out, eating better) you might lose her if you don't join her.
sorry if I sound cruel, but I know the animal, but it's me as opposed to my wife...I WANT her working out, I want her body more Lean.....she came to realize that after some harsh words by me. Which I was wrong to say, but.....she is hotter then ever and loves her body now....so do I.
So get there, she wants the same, while she won't say it, but she wants you in better shape....trust me.