Could you try that then, just book an evening exercise class to try out. Once a week might not seem like much, but it would be a step in the right direction, as a previous poster said.
I honestly have terrible motivation when it comes to exercise, which is why I don't bother working out at home anymore, because I always found a million excuses not to do it.
But I eventually found an exercise class I enjoy (or at least one I don't hate) which makes it easier. Also, I book online and pay for the classes in advance, and I usually do them on regular days, so after a while it becomes just something I do on Thursdays and Sundays. Also I have it scheduled in so I don't forget it, and it's more like an appointment.
I feel more obligated to go, as if I miss it I will lose the money. Plus I know from experience when I get there it'll be fine, it's just the motivating myself to do it bit.
Basically I've learned from experience that I sort of need to trick myself into doing it, because my natural inclination is not to bother (even though I actually quite enjoy it) because I'd much rather sit on the couch and eat cereal - so I put in place these tools to help stay disciplined.
Could you try something like that - tell your husband that one night a week you need a fews hours to do something, whatever it is. Then try out a few different classes and see which one you prefer. Make than another small step.