Phone interview (about 20 minutes after I applied online) lasted about 15 minutes. When I went for my in person interview about 3 days later, I met with two Assistant Department Heads and the Department Head. Pretty simple interview. Normally they do a third interview where you take another trainer through a workout, but this wasn't required for me.

Extensive interview process that was made up of 3 in person interviews. 1st interview was with the Fitness Manager, the 2nd was with the assistant Fitness Manager to assess how comfortable you feel on the floor talking to members, and the 3rd was with the General Manager to get a better understanding of how the gym runs as a whole unit and discussing the role you play as a Fitness Professional.