Key concept
"" Don't change something unless you have better idea ""
Key discipline
"" Listen to the athlete and responding to that accordingly...
Player's comment
"" RW said that I dont wanna be a test pilot every year trying to do something may or may not be better "
Got small improvement on XXX together made an big change.
I'm not convinced actually..
Flight speed = material improvement of flight plate
Upper = Dimension change
Less shoe race hole..