You can visit a Cardio Respiratory Physiotherapist if you have any concern with Pain ( Typically Back / Neck/ Knee etc ) or Mobility ( Reduced Flexibility / Low Range of Motion etc ) . Also SInce Cardio Respiratory Physiotherapist is medicine free treatment with no side efects , Cardio Respiratory Physiotherapist should be your First option for seeking treatment / consultation. You dont need a Doctor's prescription for the same. After proper assesment ,if a Cardio Respiratory Physiotherapist feels that your condition needs interention by a doctor ( ortho/ neuro / other ), he / she would refer you to the right specialisit.