AFAA Personal Trainer Certification Practice Exam

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Study for the AFAA Personal Trainer Certification Exam. Engage with quizzes, flashcards, and multiple-choice questions. Prepare efficiently with hints and explanations to achieve certification success.

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What term describes the movement that increases the angle between two bones?

Flexion
Extension
Adduction
Rotation

The correct answer is: Extension

The term that describes the movement increasing the angle between two bones is extension. This movement is fundamental to understanding biomechanics, as it often occurs in various joints like the elbow, knee, and hip. In extension, one bone moves away from another, which results in a straightening motion that increases the angle at the joint. For instance, when you straighten your arm from a bent position, you perform extension at the elbow, thus increasing the angle between the humerus (upper arm bone) and the radius and ulna (forearm bones). Extension is an essential concept in physical training, as it helps maintain balance and joint mobility. Understanding this movement is crucial for personal trainers who design programs that promote range of motion, flexibility, and strength through various exercises.