The best way to search for articles is to use databases, which allow you to search through thousands of journals at once. You can read the abstracts of articles and then pursue the full-text if desired. For articles relevant to a variety of fitness activities, the most relevant databases will be CINAHL Complete, Medline, and PubMed, and they are all available on the subject database page for Nursing, Medicine, and Allied Health. Academic Search Premier is a general, all purpose database that has many relevant journals.