I want my girlfriend to go to the gym, but she likes guitar. What should I do?

I think this kind of subjective conflict can only respect each other. The other party is an independent individual. Although she is your girlfriend, she will be with you in the future, but you can't ask her to live according to your wishes and become what you think. Similarly, you like to keep fit. If she asks you to learn guitar from her, you can't be interested. This requires self-knowledge. Only when she thinks she needs to exercise, will she go. If you just think about it, it will definitely backfire. She will think that you are asking her to do something to be with you. This feeling will make people very disgusted. She thinks she is fine now, so don't impose your fantasy on her again.