Google Scholar is an online academic search engine designed to index scholarly sources, citations, and other resources. Google Scholar can provide full-text options for some resources.
PEDro is an online database based out of the University of Sydney. PEDro provides access to over 60,000 randomized control trials, systematic reviews, and evidence-based clinical practice guidelines. Note that "physiotherapy" is commonly used outside of the US in reference to "physical therapy."
PubMed is an extremely comprehensive online database offered by the National Institutes of Health. PubMed facilitates citation searching across MEDLINE, PubMed Central (PMC), and Bookshelf. Some full text is available.
ACSM is a professional organization with the mission "to educate and empower professionals to advance the science and practice of health and human performance" (from website).
An organization for athletic trainers who serve student-athletes in higher education. Includes information for further certification, as well as continuing education for its members.