I applied in-person. I interviewed at Best Fitness (Boston, MA) in Oct 2018
Interview
They tend to like to know availability and what your schedule looks like so they can try to accommodate to your needs. Questions won't be to hard and will realistically be to gauge your sociability.
It was a quick and friendly interview! No pressure felt very welcoming and made me excited about working there. Did a test class as an audition which felt very comfortable and encouraging.
I applied online. The process took 2 weeks. I interviewed at Best Fitness (New York, NY) in Mar 2015
Interview
The Interview process was about thirty to about 60 minutes long. It wasn't hard and it wasn't easy. It was really just a good opportunity for the company and I to feel each other out while deciding if we were the right fit for one another. The interview was with two managers one from sales who would eventually be my boss.