Applied online, which is how most hiring at the Y is done. The branch's Sales Director called me a few days later to do a phone interview (basically reviewing my resume).
After the phone interview, I went into the branch for an in-person interview with the Sales Director. This interview was pretty basic and a lot of situational/behavioral questions. The main thing he was looking for in that interview was if my personality would mesh well with the team and if I was believable (basically, if he would buy something from me). I know those were the things he was looking for specifically because he told me after I worked there for a while (I was curious!). Sales Directors come in all styles though, so some directors may be looking for a much more aggressive sales style than what mine was.
After the branch interview with the Sales Director, I was contacted a few days later to schedule another interview with the District Sales Director (usually the 3rd interview would be with the VP of Membership Sales but he was out of town that week). This took place at HQ (the ATC) and was focused more on the organizational level of the job and the Y's culture. The guy didn't give anything away - I left knowing that he either loved me or hated me but I had no idea which one it was.
A couple days later, the Sales Director called me with an offer. Overall, the process was pretty quick since that location was in immediate need of a sales advisor.