Which factor is crucial for the reliability of maximal strength tests?

The crucial factor for the reliability of maximal strength tests is exercise selection. When conducting maximal strength tests, it is essential to choose exercises that effectively target the muscle groups being assessed while being representative of the athlete's training. Different exercises can engage muscles in varied ways and can influence the measurements of strength obtained.

Using a consistent and appropriate exercise selection ensures that the variables are controlled, allowing for repeatable and accurate assessments over multiple testing sessions. For instance, one might see differences in strength output between a back squat and a leg press, even when testing the same individual, due to the different mechanics and muscle recruitment patterns involved in each movement.

Therefore, ensuring that the same exercises are used during sequential tests is fundamental to obtaining valid results that reflect an individual's true maximal strength capabilities, making exercise selection a pivotal element in the reliability of these tests.