I'm a little late in the discussion. The easiest way is to jump in to your niche and ask for feedback. As you can see below, there is a multitude of information at your fingertips.

Here at Wealthy Affiliate, you may build websites, make money the way you may dream to approach in making money. Correct, one way is through Affiliate links. Remember that Wordpress has some plugins you can discover, and there honestly I found an example for you, mylivechat plugin, that offers affiliate program as well, I can track visitors clicks, signups, I can then earn revenue.
Here using wordpress, you can keep expressing into your own way, It's knowledge and help you kindly give to others. You helping others so that you at least working towards paid labor. Now, being your own boss, build rich your topic. Ideas?
Try using an affiliate service that matches you, then get affiliate links onto your page. The service could be just interaction. One friend at Wealthy Affiliate shared Shareasale.com to me. I signed up as an affiliate, I can choose the psychic ads, join the program, so I can use the ads into my site, so I can help market, "share" a "sale", is my point here.
With jumping ropes, fitness, healthy eating, is great niche. You can even create videos how to be healthy! You can even build a physical education, online tutoring or any service site you wanted! :)