Who is the woman?

M：So how does everything look，doctor?
W：We’ve just got all of your laboratory results back, and it looks like you’re in good health, Mr. Jackson. Sorry it took us a couple of weeks; the lab is very backed up with work this month.
M：No problem. Do you have any specific recommendations?
W：Yes, you probably should be getting more exercise．Try to work on that before your next appointment. See you in six months.
Number 38.Who is the woman?
Number 39.What does the woman advise the man to do?
Number 40.When will the man probably go back to this place?