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.
Think about keywords related to running to start your search in the library's WorldCat@SU 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 Heading 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:
The databases featured in this box are particularly useful for this class. You can learn more about databases on the Research Hub.