Two interviews. One was a very basic one going over the job description and expectations. It's a time for you to ask questions. They'll ask the basics: your background in the field, why you want to work there, etc. Show up in slacks and a polo. The second was a personal training session with the hiring manager. You take them through a 30 minute workout, then you'll sit down at the desk and they'll go over what you did well in the session and what you could have done better. Show up in workout attire.