Illegal Question:

Interviewer may ask questions pertaining to your ability to perform specific tasks, such as "Are you able to safely lift and carry items weighing up to 30 pounds?", or "This position requires standing for the length of your shift, are you able to do that comfortably?" or "Are you able to sit comfortably for the duration of your shift?"

Under no circumstances is a prospective employer allowed to ask your height, weight, or any details regarding any physical or mental limitations you may have, except as they directly relate to the job requirements. If you choose to reply, you can state "I am confident that I will be able to handle the requirements of this position."