NETA Personal Trainer Practice Exam

What is meant by extension in terms of movement at a joint?

1. A movement that decreases joint angle

2. A movement that maintains joint position

3. A movement that increases joint angle

4. A movement limited to the upper body

The correct answer is: A movement that increases joint angle

Extension refers to the movement at a joint that results in an increase in the angle between the bones that form the joint. This action typically moves the parts of the body further apart and is commonly seen in movements such as straightening the elbow or knee after it has been flexed. For example, when the arm is extended, the angle at the elbow increases from a bent position to a straight position. This is crucial for understanding various exercises and functional movements, as many training regimens include extension movements to promote strength and mobility in the joints. In contrast, the other options describe different types of movements or are not accurate definitions of extension. For instance, decreasing a joint angle is referred to as flexion, while maintaining joint position does not pertain to either flexion or extension specifically. Additionally, while extension can occur in the upper body, it is not limited to that region; it can apply to multiple joints throughout the body, including the legs. Understanding the concept of extension aids in effectively designing workout routines that incorporate a full range of motion.