My husband totally supports me in my touring, and i totally support him in his rock climbing.
Of course, when we met, I was riding my bike across the country and he was rock climbing, so there weren't any surprises about this.
I guess if either of us had something we wanted to do for multiple months, that would be more difficult, because it would leave the other with all the pet and house care, but we haven't crossed that bridge yet. The pets and house are more recent acquisitions than the relationship.