Answers how often an exercise or an activity is performed within a certain time frame The overload false Frequency true Intensity false Single The duration of each physical activity session, and the time of day the sessions are performed. Time true Reversibility false Individualization false Single States that a plateau in gains will be reached if an individual fails to modify the physical activity program. Frequency false Variation and adaptation true Recovery false Single The most important principle to keep in mind Type false Time false Individualization true Single States that the specific actions and movements in the main physical activity or exercise must be practiced and trained. Specificity true Intensity false The overload false Single A principle frequently disregarded, but quite truthfully very important. This principle recognizes the importance of rest and recovery for the muscles and the body, as well as the mind, to be ready for the next bout of physical activity. Individualization false Recovery true Time false Single States that while goals and gains may be achieved, they may also be lost, especially with detraining and inactivity. Reversibility true Type false Variation and adaptation false Single States that it must be safely overloaded for the body to benefit from and adapt to physical activity and exercise. Recovery false Individualization false The overload true Single The kind of physical activity or exercise to be performed. The overload false Time false Type true Single This is a subjective principle that may be qualified using scales such as 1 to 100 or low, moderate, or high Intensity true Frequency false Reversibility false Single