Now that you are settling back into "real-life" and life as a married couple, I suggest scheduling some exercise time together. In fact spouses can inspire healthy habits in their mate. From experience I would say nagging is not the way to go - it is annoying and not so effective. Instead you and your spouse should workout together and there are so many ways for the two of you to get physical.
You can bike together and really go all out in your new super cuteness as newlyweds and ride a tandem bike. There are also the classic outings for pairs like jogging, hiking, and tennis. Don't feel like you have to limit yourself to these, experiment with different activities like Salsa dancing, rock climbing, or tandem yoga poses like the airplane. After an invigorating workout you can give each other massages.
If exercising as a couple is new to you, these tips on how to exercise with a partner will be helpful to you. Remember all good marriages are based on these principles: love, honor and negotiation. OK - I read that on an appliquéd pillow somewhere, but it is really true.