It says the median is 56k, but thats probably skewed due to the "trainers to the stars" making 250K plus.
I'd best the vast majority of your regular old "personal trainers" make under 30k/yr.
"Median" actually is not very sensitive to such things since relatively few trainers make that much. Mean would be more sensitive. Example:
If nine trainers make $10,000 and one trainer makes $1,000,000, the mean is $109,000 and the median is $10,000.
Actually I think they should be reporting the mode (most common salary).