This is my life. I tell my wife that we can walk together if it’s casual. She’ll walk 10 feet ahead of me telling me to walk faster. I try to explain to her that in the end we will have both walked the same distance at exactly the same average speed.
I built her a bike many years ago. She had some fun on it but would never ride it on her own to get into better shape. I couldn’t ride with her every single time she wanted to exercise. She also didn’t want to ride in traffic so only a trail would work for a ride. We still have that bike and my son has almost grown into it. Maybe he’ll ride it?
I’ve had exactly one girlfriend who was matched with me for riding and training. She was good and got a top 10 at collegiate nationals when we were in college.