You have two kids and were going to school at the same time? How the heck did you manage to lose 25 lbs? You are amazing!!! If you can do all that, you can do just about anything.
You've just finished the tough, expensive, often dull grind of school. You are (hopefully) through those difficult and stressful toddler years. You've got serious momentum towards getting into shape (if you're not already there). The good times are just about to start rolling, and your husband wants out? Silly man! Give him a glimpse of these good times to come - you're facing big and positive life changes - hard to see why he wouldn't want to stick around for the ride - he's done the uphill part with you.