In your opinion, how is exercise medicine?
Exercise is most definitely medicine. A simple exercise routine for general health benefits can have the same effects as blood pressure medication, cholesterol medication, anti-depressant medication, and anti-anxiety medication just to generally name a few.
If there was one thing that doctors could prescribe that would reduce risk of cancer, diabetes, high blood pressure, heart desease, and stroke that would take the place of a whole list of medication would you consider it medicine? Yes, and that one thing, that one magic prescription, is exercise.