At the start of sprinting, the front knee angle is what?

At the start of sprinting, the front knee angle is what?

• A. 90 degrees
• B. 40 degrees
• C. 50 degrees
• D. 110 degrees

Answer: (A)

The front knee is about 90 degrees at the start of sprinting. This position places the shin and thigh in a way that allows a quick, powerful push off the ground: the knee can rapidly extend while the hip drives forward, generating a strong propulsive impulse without losing balance. A knee flexed around 90 degrees also helps maintain a favorable line for force transfer through the leg into the track, supporting fast acceleration out of the blocks or from a crouched start. If the knee were more extended (around 40–50 degrees), the leg would have less usable knee flexion to absorb and redirect force efficiently, reducing drive. If it were overly bent (around 110 degrees), the transition to full extension would be slower, delaying propulsion.

The front knee is about 90 degrees at the start of sprinting. This position places the shin and thigh in a way that allows a quick, powerful push off the ground: the knee can rapidly extend while the hip drives forward, generating a strong propulsive impulse without losing balance. A knee flexed around 90 degrees also helps maintain a favorable line for force transfer through the leg into the track, supporting fast acceleration out of the blocks or from a crouched start. If the knee were more extended (around 40–50 degrees), the leg would have less usable knee flexion to absorb and redirect force efficiently, reducing drive. If it were overly bent (around 110 degrees), the transition to full extension would be slower, delaying propulsion.