Among the FITT guidelines for fitness training thresholds, which two incorporate the exercise principle of Progressive Overload?

The principle of Progressive Overload is essential for improving fitness levels, as it involves gradually increasing the workload to cause adaptations in the body. Among the FITT guidelines—Frequency, Intensity, Time, and Type—Intensity and Time are the aspects that directly incorporate this principle.

When we look at Intensity, increasing the difficulty of the exercise (for instance, lifting heavier weights, increasing the speed of a run, or adding resistance) pushes the body to adapt and improve strength, endurance, or cardiovascular capacity. This reflects Progressive Overload because, by continually challenging the body with higher intensity levels, it must adapt to meet the demands placed upon it.

Time also embodies Progressive Overload in terms of increasing the duration of physical activity. For example, if a person begins by running for 20 minutes, gradually increasing this time to 30 minutes as their endurance improves is a clear application of this principle. Extending the duration of activity forces the body to adapt to sustain performance for longer periods, contributing to overall fitness improvements.

While other options contain factors related to the FITT principle, they do not encapsulate Progressive Overload in the same explicit manner as Intensity and Time do. For instance, while frequency concerns how often one exercises, it does not