Cycling is my current
#1 sport and will be as long as I can keep it up. I train year-round, mostly cycling specific. I now ride tandem with my wife almost entirely when I ride outdoors. My wife trains with me. She uses a trainer and I rollers for riding inside when the weather's cold or crappy. I say, "To keep your flying license current, you have to keep making the payments."
We mostly train so that we can keep up with our friends on our weekly group ride, which has been going on for ~17 years. We also try to go on one or more bike tours per year.
My wife also takes dressage lessons. I don't, but I train while she's gone for a lesson.
We also go to our gym. We've had a gym membership since 1979. We do spin class, stepmill, elliptical, free weights, and machines.
In winter I ski, though my wife doesn't care for it. We both snowshoe.
In summer we day hike once/week if it isn't raining. Getting soft in our old age. For the last 35 years, we've done a 10-day backpack every year.