I applied in-person. The process took 1 day. I interviewed at Planet Fitness (Round Rock, TX) in Aug 2015
Interview
The interview was a quite normal.
All of the questions asked are from an interview book and they are open ended. If you need a second to think about the question let the interviewer know and he will probably skip it. Answer the questions with confidence and a positive attitude. Read the book Raving Fans (its only a hundred or so pages) and talk about it while in the interview. Planet Fitness customer service model is based on that book and it should help you get the job on the spot.
I applied through an employee referral. The process took 1 week. I interviewed at Planet Fitness in Jan 2013
Interview
I filled out my application one day after I worked out. I was called in that week for an interview with the manager and was called roughly a week later saying I got the job. The manager asked very good questions and answered any questions that I had.
I applied online. The process took 1 week. I interviewed at Planet Fitness (Ocoee, FL) in Apr 2016
Interview
Unfortunately I was only looking for seasonal work for the summer and they were looking for a more "permanent" solution. Little disappointed that they wouldn't even continue to interview me.