Being a serious co-dependent, I approached this in my typical bass-ackwards sort of way.
DH was having a lot of fun riding and i pretty much avoided it. He even took our sons and got them involved, I did sag.
He had a group of friends he rode with and a few years ago; they all moved away. So DH sat and vegetated and got depressed.
I realized that the only way to get him off HIS butt was for ME to start riding... Even though I said more than a 5 mile ride was too much for me...
So I got him to "train me" for the STP ride, what, in 2003. and I haven't looked back.