How is intensity defined in the context of fitness training?

In the context of fitness training, intensity is defined as a quantifiable amount of weight, speed, or incline. This definition emphasizes that intensity is not merely subjective or based on how a person feels during an exercise but is instead rooted in measurable factors that can provide a clearer understanding of how challenging an activity is.

For example, when performing strength training, the amount of weight lifted directly influences the intensity of the workout. Similarly, in cardiovascular training, the speed at which one runs or the incline on a treadmill affects how hard the body is working. This quantifiable approach allows individuals to track their performance, monitor progress over time, and adjust their workouts to match specific fitness goals.

In contrast, the other choices reflect different aspects of fitness training. A general feeling of effort relates more to perceived exertion, which is subjective and can vary widely among individuals. The duration of an exercise session refers to how long a workout is conducted, while the frequency of workouts per week indicates how often someone trains but does not directly measure the intensity of those sessions. Therefore, the focus on measurable data in option B aligns accurately with the definition of intensity in fitness training.