Which principle of physical training involves engaging in different activities to prevent boredom and injuries?

The principle of variety in physical training emphasizes engaging in different activities to sustain motivation and reduce the risk of injuries. By incorporating a range of exercises and physical activities, individuals can keep their training routines enjoyable and challenging, which helps maintain their interest and commitment over time. Additionally, varying the types of activities performed allows different muscle groups to be worked, aiding in overall fitness and minimizing the potential for overuse injuries. This principle plays a crucial role in creating a balanced workout regimen that contributes to long-term physical health and performance improvement.