Business Executive Development Question:

Interviewers expect a candidate for employment to discuss what they do while they are working in detail. Before you answer, consider the position you are applying for and how your current or past positions relate to it. The more you can connect your past experience with the job opening, the more successful you will be at answering the questions.

It should be obvious that it's not a good idea talk about non-work related activities that you do on company time, but, I've had applicants tell me how they are often late because they have to drive a child to school or like to take a long lunch break to work at the gym.
Keep your answers focused on work and show the interviewer that you're organized ("The first thing I do on Monday morning is check my voicemail and email, then I prioritize my activities for the week.") and efficient.