Which of the following exercises is NOT an example of measuring muscular strength?

The 3-minute step test is not an example of measuring muscular strength because it primarily assesses cardiovascular endurance rather than strength. This test involves stepping up and down on a platform for a specified duration, which effectively evaluates how well the heart and lungs supply oxygen to the muscles during sustained physical activity.

In contrast, the bench press, leg press, and grip test focus specifically on measuring the maximum force that muscles can exert. The bench press targets the upper body, particularly the chest, shoulders, and triceps. The leg press assesses the strength of the lower body, especially the quadriceps, hamstrings, and glutes. The grip test evaluates grip strength, which is indicative of overall muscle strength and function in the hands and forearms. Thus, the other exercises are directly related to the capacity of muscles to perform an exertion, while the 3-minute step test centers on endurance.