Which principle states that exercise intensity must be increased as the body adapts?

The principle of progression is fundamental in exercise science and refers to the need to gradually increase the intensity, duration, or frequency of exercise as an individual adapts to a particular workload. This concept is based on the understanding that the body continuously adjusts to the stresses placed upon it. If the intensity of exercise remains static, the body will not continue to adapt, leading to a plateau in performance improvements, strength gains, and overall fitness.

By implementing the principle of progression, individuals can ensure that their training remains effective and that they continue to see physiological adaptations. For example, a person who regularly lifts weights may need to increase the weight or the number of repetitions to continue making strength gains. Similarly, a runner might need to gradually increase their running distance or speed to improve their endurance and cardiovascular capacity.

Each step up in intensity must be manageable to minimize the risk of injury while promoting continuous improvement. This principle highlights the need for a structured approach to training, focusing on gradually challenging the body to optimize performance gains over time.