Which principle emphasizes the gradual increase in the amount and intensity of physical activity?

The principle that emphasizes the gradual increase in the amount and intensity of physical activity is known as the principle of progression. This principle is fundamental in exercise programming, as it encourages individuals to incrementally increase their workload, whether it's in terms of duration, intensity, frequency, or complexity of exercises.

By adhering to this principle, individuals can avoid plateaus in their fitness journey and reduce the risk of injury that can occur from sudden or excessive increases in intensity or volume. It allows for a structured approach to improving fitness levels over time, ensuring that adaptations occur safely and effectively.

This principle supports the notion that an incremental approach to increasing exercise load leads to more sustainable long-term improvements in strength, endurance, flexibility, and overall health.