Which biomechanical cue is associated with maintaining a tall but forward-leaning trunk during sprinting?

• A. Tall but forward-leaning trunk
• B. Upright torso
• C. Slouched posture
• D. Backward-leaning trunk

Answer: (A)

Maintaining a tall trunk with a light forward lean helps you convert vertical force into forward propulsion. A tall posture keeps the spine elongated and the hips in a strong position for hip extension, while a forward lean helps align the center of mass with the direction you’re moving. This setup allows the ground reaction force to push you forward rather than upward, reducing braking and supporting a quick, powerful turnover. In contrast, an upright torso tends to limit forward propulsion, a slouched posture wastes tension and energy, and a backward lean often increases braking forces, hindering speed.