How much touching is necessary?

I'm seeing a physiotherapist and wondered how much touching is necessary. It's for a leg complaint. I know it's their job but she can't keep her hands off me. I was just wondering how much touching is normal in a session, when she shows me some of the excersizes she stands so close our bodies are touching, she doesn't really talk to me much in a social context so i wouldn't say she fancies me, but it is kind of freaking me out.