1. Fastest lens you can get your hands on (both in light and focusing so you are looking at USM and f2.8 as a benchmark)
2. AI Servo on at least a 15 point AF for your body
3. A nice bright day.

That is pretty much all i can deduce from doing it once on a cloudy day with a 9-point af system with an effective f/5.6 lens... (f/2.8 on a 2x TC)

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography