What does the principle of progressive overload involve in strength training?

The principle of progressive overload is fundamental in strength training as it emphasizes the importance of gradually increasing the intensity or volume of exercise over time to continually challenge the muscles. This gradual increase is essential for promoting adaptations that lead to improvements in strength, endurance, and overall performance.

When applying progressive overload, athletes or individuals engage in a systematic increase in weights lifted, repetitions performed, the frequency of workouts, or even the overall volume of activity. By doing this, the muscles are continually stimulated to adapt to the increasing demands placed upon them, which helps to overcome plateaus and prevents stagnation in progress. This principle is not just about lifting heavier weights but can also apply to increasing the duration or complexity of workouts to enhance muscle growth and strength.

Therefore, the correct answer encompasses a crucial aspect of strength training, highlighting the necessity of gradual progression to optimize gains and enhance physical capabilities.