Great action photography can be all about timing. Generally, you need very fast shutter speeds to capture moving subjects, but this can make it difficult to get good exposure and focus. So remember that even fast moving objects travel more slowly at some times than others. A basketball player at the peak of his jump or a hockey player who is changing direction is moving more slowly than they would be in the seconds before and after. If you can capture these moments, you will be able to use a slower shutter speed, which can result in better exposure and clearer images!