According to the ACSM guidelines, what measures how hard you work during exercise?

Intensity refers to the level of effort or exertion expended during exercise. According to the American College of Sports Medicine (ACSM) guidelines, intensity is a crucial component of physical activity because it determines how hard an individual is working. This can be evaluated through perceived exertion, heart rate, or the amount of weight lifted, among other methods.

Duration and frequency are also important components of a well-rounded exercise program; however, they do not specifically measure the level of exertion during the activity. Duration refers to the length of time spent in physical activity, while frequency indicates how often you exercise within a given timeframe. The type of activity refers to the specific exercises being performed, such as aerobic or resistance training but does not convey how hard the exercise is being performed.

In summary, intensity directly measures the effort level during exercise, making it essential for establishing effective exercise prescription and ensuring individuals are working at a level that is appropriate for their fitness goals.