Is this sentence correct:
"He is a 500 hour qualified firness instructor."
Note: By this, I mean that the qualifications of the instructor is the attendance of a 500 hour course.
That doesn't sound good. I suggest eg " He is a qualified fitness instructor, after a 500-hour course. "
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That doesn't sound good.
I suggest
eg "He is a qualified fitness instructor, after a 500-hour course."