flyguy wrote:
If you put your Canon Camera into "AI Servo Mode" the camera will maintain focus even if the subject moves.
Also, with Image stabilization on, you can set your shutter speed much lower and it should compensate up to three stops of shutter speed, if necessary, and give you a good exposure.
Another thing, which I have done, is to use the "back button" focus which helps me focus better better and shoot faster.