Natural light was on the wrong side to bring out their chests, a shutter of 1/500th would stop it better on their fingers, but the bit of motion blur adds to the speed of their motions. Not knowing how far you were from the players, a strobe might have punched up your subjects contrast and using a rear sync on that flash puts the motion blur behind the direction of motion and makes then more natural.
I like this one. You've stopped the motion well, but there seems to be a good bit of noise in the shot. For some reason, it fits. This looks a lot like a Nike ad.
This is a decent Action Shot for content. The image itself seems flat and could use some contrast to liven it up some. A tad underexposed, and a little noisy also.