AFAA Primary Group Exercise Certification Practice Test

Flexion in joint actions is defined as the bending of a joint between two bones, which results in a decrease in the angle between the two parts. This movement occurs in various joints throughout the body, such as the knees, elbows, and hips. When flexion takes place, the distal segment (the part farther from the body's center) moves closer to the proximal segment (the part closer to the body's center).

Understanding the concept of flexion is essential in exercise science, as it applies to many movements performed in various forms of physical activity. During exercises such as bicep curls, the action of lifting the weight towards the shoulder involves flexion at the elbow joint. Knowledge of this fundamental movement pattern helps in designing effective and safe workout programs for different fitness levels.

The other options describe different types of movements that do not align with the definition of flexion, such as abduction (movement away from the midline) and adduction (movement towards the midline), while increasing the angle between two bones refers to extension, not flexion. Recognizing these distinctions is crucial for understanding biomechanics in exercise and improving instructional techniques.