Like Rick requested please post one of your pics. Basically you have two problems to overcome, first is the light, probably can't use flash plus even if you can it is not effective over any distance so what to do, open your lens up to allow the most light in ie if it goes down to f2.8 set it to f2.8. Increase the ISO to a higher number, you may be up to ISO 640 or 800 or even more to allow for a fast enough shutter speed which brings me to the Second, you will need a faster shutter speed to freeze the action but that won't happen if you can't get enough light on the camera sensor.