The SPPB Guide provides an efficient and reliable way to learn, administer and record the Short Physical Performance Battery (SPPB) and gait speed test for use in clinical care and research. The SPPB Guide standardizes test administration by providing complete guidelines for setting up and administering the tests, including course layout and an instructional script, and uses the stopwatch function of the phone to capture the needed data. The SPPB Guide algorithm calculates all scores and produces an electronic summary report in PDF and Excel formats that can be printed or emailed.