Which training principle refers to gradually increasing the intensity of workouts?

The principle that refers to gradually increasing the intensity of workouts is known as progressive overload. This concept is fundamental in fitness and strength training, as it emphasizes the necessity of incrementally elevating the workload placed on the body during physical activity. The slight and continual increments in intensity, which can involve increasing weights, repetitions, or overall workout duration, drive the body to adapt and improve its strength, endurance, and overall fitness levels. By following the principle of progressive overload, individuals can avoid plateaus in their training progress and continue to make gains in their physical capabilities.

The other principles mentioned serve different functions in training. Specificity refers to training that is tailored to meet specific physical goals or skills, such as targeting certain muscle groups for strength or endurance. Reversibility emphasizes the effects of detraining when one stops exercising, which can lead to the loss of fitness gains. Periodization involves structuring training into cycles to optimize performance and prevent overtraining. While these principles contribute to effective training programs, they do not directly relate to the process of gradually increasing workout intensity like progressive overload does.