If you’re a fitness buff and have the right combination of charisma and business sense, working as a part-time online personal trainer can be both physically and financially rewarding. Once you build up a reputation and client base for yourself, it could easily turn into a full-time endeavor for you. Check out this interview with several fitness blog owners who are making a living online, from MonetizePros. As well, I'd recommend checking out this resource if you want to take this business idea seriously and get started with a business plan for your personal fitness trainer business today.
Strive to become an authority. It doesn’t matter if your niche is the silliest topic in the world, as long as you’re “THE” site to check out when it comes to everything about fidget spinning (or whatever niche you decided to focus on), then your website is a success. To become an authority within your niche, you have to be consistent with publishing content, provide value to your readers, and make it a goal to earn your readers’ trust.
Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.