In sprint start, the arm elbow flexes to what angle as the hand swings toward the forehead to enhance momentum and overcome inertia?

In sprint start, the arm elbow flexes to what angle as the hand swings toward the forehead to enhance momentum and overcome inertia?

• A. 45 degrees
• B. 90 degrees
• C. 135 degrees
• D. 0 degrees

Answer: (B)

The question is about the optimal elbow angle for a fast, effective arm drive in a sprint start. When the hand swings toward the forehead, the elbow should be bent about 90 degrees. This right-angle position gives the arm just enough bend to create a quick, compact arc with high angular velocity, while still allowing the hand to travel upward toward the forehead efficiently. That combination helps convert the arm’s motion into forward momentum, aiding the push off the blocks and helping overcome inertia as you accelerate. If the elbow were nearly straight, the swing would be slower and less explosive; if it were overly bent, the forearm wouldn’t reach the forehead cleanly and the drive would be awkward and less powerful. So, 90 degrees is the most effective angle for this movement.

The question is about the optimal elbow angle for a fast, effective arm drive in a sprint start. When the hand swings toward the forehead, the elbow should be bent about 90 degrees. This right-angle position gives the arm just enough bend to create a quick, compact arc with high angular velocity, while still allowing the hand to travel upward toward the forehead efficiently. That combination helps convert the arm’s motion into forward momentum, aiding the push off the blocks and helping overcome inertia as you accelerate. If the elbow were nearly straight, the swing would be slower and less explosive; if it were overly bent, the forearm wouldn’t reach the forehead cleanly and the drive would be awkward and less powerful. So, 90 degrees is the most effective angle for this movement.