When I coached table tennis in a school program, I was coaching up to 90 kids per day.  Over the last 20 years, I have seen thousands of kids play (or attempt to play) table tennis.  Sarah Jalli is one of my top juniors and recently went up 1000 rating points in 10 months and is now ranked #4 in the US for her age.  With the right environment and a great work ethic, Sarah definitely has Olympic potential.  So why is it that some kids rise to the top and others stay at the lower level?
 
Desire