It also probably depends on locale (most do). So while the percentage may be the same across the gyms, the dollar amounts may be substantially different.
I think their pay depends on the certifications and degrees you are currently holding and by the number of sessions you do per week. I believe it’s different for each city. This information is based solely on an interview I went through with them when I was checking for new places to work at, some years back when I lived in Chicago. They might have changed their pay structure by now.
Have you tried to contact Crunch Human Resources in the Portland area?