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What was the problem with the photos? Were they out of focus? Exposure problems? I can tell you from first-hand experience that your gear choice is going to make it really difficult. The 300 is really long for indoor skateparks. I would go with a shorter lens like a 70-200, ISO 6400, f/2.8 or faster, correct wb, and you should be ok. Maybe bounce your 580 off the ceiling if you need a bit more light. Your proximity to your subject will play a part in tracking also. The closer you are, the harder it will be to keep the focus point on him. Try setting your focus point to have surrounding points active, and set the AF mode to the standard setting (first one in the menu). Skaters don't move very fast and it's pretty easy to predict their movement.
Thank you. The problem was motion blur; Exposure was very close and corrected with +1 EV; I will try the 70-200 next time, but mine is an F4 IS; The lighting was so bad that the facial shadows obscured all detail. Could have improved in PP but was hoping to get it right in camera. Again, thank you, Jim