Explanation:

Introduction:
Physical activity involves various types of movements that contribute to overall fitness and well-being. These movements are categorized into different types based on their direction and action. However, one of the options listed in the question does not belong to these types of movement related to physical activity.

Types of Movement:
1. Abduction: Abduction is a movement that refers to the outward or lateral movement of a body part away from the midline of the body. For example, lifting the arm sideways away from the body or spreading the fingers apart.

2. Adduction: Adduction is the opposite of abduction. It involves the inward or medial movement of a body part toward the midline of the body. For instance, bringing the arm back to the side of the body or closing the fingers together.

3. Extension: Extension is a movement that increases the angle between two body parts. It involves straightening or stretching a limb or joint. For example, straightening the knee or extending the elbow.

Explanation of the Correct Answer:
The correct answer is option 'D' - None of these. This means that all the options listed (abduction, adduction, and extension) are types of movement related to physical activity. Therefore, the answer 'None of these' indicates that there is no movement unrelated to physical activity among the given options.

Conclusion:
In summary, the options listed in the question (abduction, adduction, and extension) are all types of movement related to physical activity. Hence, the correct answer is option 'D' - None of these.