What are the current trends in fitness?
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I would be wary of using or following a “trend”. Your business model should be based off of your expertise, passion, education, and knowledge. You want to establish yourself as one of the best in your field because your reputation will keep you current even when all of the hype and hoopla disappears.
That said, you can find great article on general business practices and ideas here on IDEA, ACE, & almost any other reputable fitness agency.