The interviewer has likely already inquired about your formal education and now wants to learn if you've taken any extra courses or training on your own time to further your competencies and skills. Consider topics like continued training in Assistive Technology, Aquatic Therapeutic Exercise, Basic DIRFloortime. Certified Hand Therapy, Certified Lymphedema Specialist, etc., that you may have completed since graduating. Provide the interviewer with your extra education, and if you haven't completed any, be honest and describe topics or training you would be interested in pursuing.