I have to say a little bit of both too.
He loves to go for walks, but won't run, so I almost feel like I'm being held back from getting *more* exercise. I finally convinced him to come kayaking with me this summer and against his better judgment

he had a fabulous time and wants to do it all the time now which is good. BUT, if there is a major golf tournament on TV (which seems to be all the time), it's hard to get him away from it.
On the food end of things, he eats too many potato chips and soda, but those things don't tempt me, so it doesn't hold me back, but they're not good for him. Neither of us eat enough fruit and veggies (we're both fairly picky).
I think the worst thing is that our timing is off and we don't seem to motivate eachother. If I am wanting to exercise and push him too much, he gets mad. If he wants to exercise, it motivates me to exercise also, but we rarely agree on what we're going to do for exercise.