What main aspect does the principle of specificity address in training?

The principle of specificity emphasizes that the body adapts to the specific demands placed on it during training. This means that for an individual to achieve a desired outcome, the exercises they perform must closely align with the goals they are trying to achieve. For example, if a person trains for endurance, their workout regimen should primarily consist of activities that improve aerobic capacity, such as running or cycling. Conversely, if the goal is to build muscle strength, the focus should be on resistance training exercises.

This principle ensures that the adaptations the body undergoes—whether that be increased strength, improved cardiovascular fitness, or enhanced flexibility—are directly linked to the types of exercises selected for the training program. By tailoring the exercise selection to match the specific goals of the individual, trainers can optimize results and improve performance in the targeted area.