The number of ebike suggestions in this thread makes me wonder how many women who take training seriously actually get ebikes to keep up with faster spouses on joint training rides? Personally I’d (much) rather save rides with my husband for easy days and train on my own (or do something like @splash suggested), and if he asked me to get an ebike to keep up with him we’d probably Have Words.
This is essentially low-cadence training, and it can be great if you’re trying to get better at low-cadence riding. Good starting point for some of the discussions around the forum: