I made a quick wireframe similar to the design file I was given:
This is for a /blog page. Not the individual posts. On this page, you can select which categories to view (all, fitness, diet, drugs).
When you click on a blog category, it would re-render the 3 visible blog posts on the /blog page that have the blog category without reloading the page.
Clicking on the blog post would link you to the individual blog pages.
I just want to know if this is possible before delving deeper.