Advice Needed on Husband Gaining Weight

Help a fellow FitSugar reader out. Her hubby used to be active, but now, not so much.

Dear Fit,
Before we got married, my husband and I used to exercise together all the time. We belonged to the same gym, played tennis on the weekends, hiked with our dogs, and were even on a co-ed volleyball team. Our wedding was almost a year ago, and since then, his exercise schedule is just about non-existent. When I ask him to join me on a run or walk or anything physical, he just says he doesn't feel like it. I thought it was just a phase, but it's been almost a year and I'm noticing he's gained a slight tire around his middle. I want us to live a long, healthy life together, so how can I get him back on the workout bandwagon without seeming pushy?
—Worried Wife

If you have any experience with this, or any suggestions, please share them in the comment section below.