I am certified fitness trainer.
Hi @RajibHaque450 Welcome to the community! We are happy to have you here. I'd recommend browsing our course catalog to see what courses in this category already exists. You can also check our Marketing Insights https://www.udemy.com/instructor/marketplace-insights/ here to get a better idea.
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You can join the Instructor Club after you publish your first course. In the meantime, you’ll find plenty of help and advice in Studio U.