How to make home page posts summarized

So my site for reference is therunnersports.com and I want my home page which is also where all my posts go to display the latest post. But instead of it being the entire post like it currently is I want it to be like my categorized pages. Summarized where you must click to see more. That way my home page is not insanely long and cluttered. Whatever suggestions you have let me hear them. I am using the them red line if that helps. Thanks in advance.