NSCA Sprinting and Running Practice Test

Weight distribution during the start and early acceleration is crucial for turning horizontal force into forward propulsion. When too much weight sits on the arms, the body isn’t transferring force through the hips and legs efficiently. The arms end up doing the bracing and stabilizing work instead of contributing to the drive, which wastes energy and creates unnecessary vertical support. That imbalance means the legs can’t push maximally into the ground, slowing forward acceleration.

The correct idea here is that improper weight distribution is the cause. If the hips aren’t engaged and driving forward, you’ll see similar issues with a weak start, since hip extension is the main source of forward propulsion. Overstride, or placing the foot too far in front of the center of mass, tends to create braking forces rather than direct propulsion, and poor foot placement affects contact mechanics, but the specific cue of excessive weight on the arms is the hallmark of weight distribution being off.

In short, excess load on the arms signals that you’re not evenly distributing weight to the legs and core, which interrupts efficient transfer of force into the ground during the start and acceleration.