All athletes need strength - even endurance athletes like marathon runners! Keeping track of it by using regular strength tests like a grip test or a chin up test is an essential part of a coachs armoury.
Strength can either be tested by measuring the ultimate performance of an athlete for example, are they running any faster or by specific tests. These are useful for breaking down the components of that performance and measuring them more individually.
Thus you will find a range of tests to measure various aspects of this crucial performance element.