Credo is an academic alternative to Wikipedia, containing encyclopedias, specialty dictionaries, and almanacs. Check out this article on Running from The Gale Encyclopedia of Fitness, or this one on Track & Field. Credo's sources also list further reading and references that you can investigate in other sources.
The databases featured in this box are particularly useful for this class. You can learn more about databases on the Research Hub.
Think about keywords related to running to start your search in the library's WorldCat catalog.
When you find a good book, click the Description section of the record to find more books on the topic using the Subject Headings. Clicking on a Subject will take you to a list of all the other books in the catalog that have been classified under that subject.
Try some of these subject headings related to running in WorldCat: