This document discusses fitness testing, including reasons to conduct fitness testing, different types of fitness tests, and the importance of test protocols. It provides examples of maximal tests like the multistage fitness test and sub-maximal tests like the Harvard step test. Reliability and validity are important for fitness tests to accurately measure changes in an athlete's fitness. Test protocols help ensure tests are conducted consistently and reliably. Factors like technique, movement quality, and test set-up can affect results if protocols are not followed.