Because fitness professionals often have to be re-certified after some time, they look for ways to save money and get their education in tip-top shape. And a lot of people (I don't know the exact figures) do seem to like the concept of reading a research article and taking a short exam for just a few units. And for $25, that's a save.
That's the equivalent of me taking a $25 one-unit class editing class at a community college. If it's going to make me a better editor, it's worth the time and money.
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