Last week in Part I, we talked about the 40 Yard Dash and how it has become such an important test for football players. We also talked about the start, and the importance of proper body positions for GRF based on each athlete’s movement signatureTM. Today, we move into the acceleration phase of the 40, particularly the first 10 yards. Not only is the first 10 yards the most important part of running a fast 40 yard time, but it is also arguably a better indicator of speed for football players since acceleration and change of direction are such important parts of the game.
The First 10 Yards…Push don’t PullTo summarize the first 10 yards, it is all about stride length. Driving the ground (producing GRF) and maintaining long, efficient body positions is the key to acceleration. It is not uncommon to see an athletes who are moving their feet really fast, or who look they are working really hard in the first 10. While these athletes might look fast, they are often some of the slowest because they are spinning their wheels and fighting the air with their arms. Learning to drive the ground will transform the way they run.
Leaking ForceMaintaining a good body position for acceleration is all about preventing GRF from leaking out of the system. Forces travel best in straight lines. Any deviation from a straight line diminishes the “equal and opposite” effect of the force that was produced into the ground. We often see particular movement signaturesTM that leak force in a certain way. For example:
- Flexed: round their upper back and are not able to get full hip extension with every stride
- Hinge: are unable to get full knee flexion on the front side and “break” at the waist
- Swing: use too much rotation in torso and have cross-body arm action
- Loose: lack lower leg stiffness on ground contact and reach for long strides rather than driving for long strides.