I am not divorced but I do know the answers are never easy to find...

What you are showing your daughter is that exercise is an important part of overall wellbeing. This is vital given the increased inactivity in our children around the Western world which can lead to serious health problems like obesity and weak bones.

Is there some other physical thing she likes doing you could do with her at the weekend? - Think of it as cross-training.

I like Corsair's idea of using a trainer...

Good luck, and whether you choose to ride and leave her, or you find something to do where she will choose to be included, you are doing the right thing. You will be modelling negotiation and compromise, you will be demonstrating that self-health of the mind body and spirit is important.