What is the principle of quality? What is the principle of quantity? Give an example in which a physical activity professional would use each principle to design an appropriate physical activity experience.

The principle of quality states that the experiences that engage us in the most critical components of an activity are most likely to increase our capacity to perform that activity. Critical components are the elements of an activity that are most important for performing it at a high level. To be really good at an activity, you must focus on what factor you need most and improve that area. The principle of quantity states that when all other factors are equal, increasing the frequency of our engagement with the critical components of an activity usually

results in the largest performance improvement in that activity. Generally, the performer whose experiences have engaged her most often in the critical components of an activity usually becomes the most competent in that activity. A physical activity professional asked to create a plan to decrease the time in a marathoner's performance would begin by conducting a analysis. The critical components in this activity relate to physical performance capacity more than skill.