Watch this video of a cheetah running at full speed, taken with a high-speed camera. Note particularly how the head is held so rigidly fixed while the rest of the body goes up and down, no doubt as a result of the need to focus so intently on its prey.
I find it abominable that some people will actually kill these magnificent animals just for sport.
This second video describes how the filming was done. What surprised me was that the cheetahs were allowed to roam freely among the humans.