What makes the difference? Practice I guess, but things what you couldn't have practice in advance (my ideas were pretty random) always the same kids were one the top. Funny was also the knitting lesson for 10 years olds when one of my students were a boy from BMX track :)
Here is few exambles from the sport park designs, forexamble BMX track with water barrier:
Klick the photo below and see the most amazing video I have seeing in my life. This is what opens my eyes wide open and give the wings to my dreams. Simply admirable in every single way: