Really like the different perspective in many of these.
Very nice motion effects on #2 and #3.
I like the story in #1 and #6
Not so keen on #4 (long jumper) - too loose and not great position to shoot from (but I suspect you were probably restricted as to where you could kneel)
I think #5 would be more effective if you cropped the bottom 50% and turned it into a panorama crop.
Cropping tighter would probably make for more dramatic/interesting images - as it would remove the uninteresting and distracting elements, allowing the viewer to focus on the subject/action.
As a first up, I think you should be pretty pleased with not only the results but also your "thinking outside the square" point of view. Definitely a good start to your "athletics" career!
From the "Land Down Under" ... South Australia