Which description best matches the orientation of the leg and trunk during acceleration?

Which description best matches the orientation of the leg and trunk during acceleration?

• A. Extended leg and trunk form a power line along the long axis
• B. Bent trunk with extended leg
• C. Twisted torso with flexed knee
• D. Rounded back with leg tucked

Answer: (A)

During acceleration, you want the body stacked in a straight, extended line so the leg drive and the trunk form a single power line along the body's long axis. This alignment lets the athlete push directly into the ground and transfer that force forward with minimal energy lost to rotation or bending. An extended leg and tall trunk keep the center of mass forward and the hips stacked under the shoulders, which maximizes forward horizontal force production. If the trunk is bent, or the torso twists, or the back rounds with the leg tucked, the line of force misaligns. That creates wasted movement, more braking or vertical effort, and less forward propulsion. So the description that best matches acceleration is an extended leg and trunk forming a straight power line along the long axis.

During acceleration, you want the body stacked in a straight, extended line so the leg drive and the trunk form a single power line along the body's long axis. This alignment lets the athlete push directly into the ground and transfer that force forward with minimal energy lost to rotation or bending. An extended leg and tall trunk keep the center of mass forward and the hips stacked under the shoulders, which maximizes forward horizontal force production.

If the trunk is bent, or the torso twists, or the back rounds with the leg tucked, the line of force misaligns. That creates wasted movement, more braking or vertical effort, and less forward propulsion. So the description that best matches acceleration is an extended leg and trunk forming a straight power line along the long axis.