听下面一段独白，回答以下小题。
【小题1】What does the speaker probably do?

A．She’s a medical doctor.

B．She’s a fitness instructor.

C．She’s a swimming coach.

【小题2】What is a common workout mistake?

A．Focusing only on building muscles.

B．Taking too many types of exercises.

C．Doing the same routine all the time.

【小题3】How often does the speaker suggest people do hard workouts?

A．Once a week.

B．Twice a week.

C．Three times a week.