What questions should i ask in a interview with a personal trainer?

I'm Aine's sister and i don't know if i want to be a personal trainer or nutritionist. i have a interview with a personal trainer to ask her why she was a personal trainer and to ask her more questions. but i don't have that much questions, i only have 2 questions. they are: why did you choose to become a personal trainer and what college did you go to for your degree? can you please post some questions i should ask the personal trainer???