What is the cause of ineffective arm movements described as transverse movement, excessive backward swing, and hunched shoulders?

What is the cause of ineffective arm movements described as transverse movement, excessive backward swing, and hunched shoulders?

• A. Excessive shoulder movement; insufficient shoulder joint flexibility.
• B. Fatigue; poor breathing technique.
• C. Excessive leg stiffness.
• D. Inadequate trunk rotation.

Answer: (A)

Arm mechanics in sprinting rely on a smooth, compact swing in the sagittal plane with relaxed shoulders. When the shoulder joint lacks flexibility, the arm can’t move efficiently through space, so it tends to drift across the body (transverse movement) and swing too far backward because the elbow and forearm can’t tuck and recycle quickly. The shoulders then rise and the upper back rounds to compensate, producing a hunched posture. This combination—side-to-side or cross-body motion, excessive backward swing, and a rounded shoulder posture—fits with insufficient shoulder joint flexibility and excessive shoulder movement. The other options don’t directly create this specific pattern: fatigue or poor breathing affects overall rhythm and endurance but not this targeted arm-kinesis; leg stiffness changes leg drive; and inadequate trunk rotation affects torso twist more than producing the described arm pattern.

Arm mechanics in sprinting rely on a smooth, compact swing in the sagittal plane with relaxed shoulders. When the shoulder joint lacks flexibility, the arm can’t move efficiently through space, so it tends to drift across the body (transverse movement) and swing too far backward because the elbow and forearm can’t tuck and recycle quickly. The shoulders then rise and the upper back rounds to compensate, producing a hunched posture. This combination—side-to-side or cross-body motion, excessive backward swing, and a rounded shoulder posture—fits with insufficient shoulder joint flexibility and excessive shoulder movement. The other options don’t directly create this specific pattern: fatigue or poor breathing affects overall rhythm and endurance but not this targeted arm-kinesis; leg stiffness changes leg drive; and inadequate trunk rotation affects torso twist more than producing the described arm pattern.