Below is a video of members of the USA Women's National Team (USWNT) doing an agility test.
Please note how they shorten their steps and lower their centre of gravity as they change direction:
Below is a speed test used by Cristiano Ronaldo in a Nike commercial ...
Here is what you can learn by watching this video:
- frequency of steps
- closeness of ball to his feet at all times
- how stable his core is