Here is a site https://domyhomework.guru/blog/homework-benefits that would help you to become a better writer. Cheers!
For BECOMING a better writer about any topic you need to have a deep knowledge about that topic another thing which also makes your article or anything you write better, is doing that thing by your own self for example if you are writing about swimming so you should know what are the rules or tactics follow during swimming and when you wrote that rules in article by your own experience it will build a good impression on your readers and they will think you are expert or a person whom they can trust.
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Best way of becoming a fitness blogger is knowledge, more you have knowledge more you will write on it. So read more and more on internet and meet experts and professionals.
The big thing is finding you target audience. Who do you want to speak to? Then how do you want to come across? Some writers scratch the surface where others get deep with their topics. All in all focus on you and what you want to write about deep down. The more you do it the easier it will become.