dancingalone
Grandmaster
Not really if you consider the meaning of the word. Hand, foot, and way. The jump kicks are a direct result of the introduction of the cavalry attacks Koreans became subject too.
Sean
If you meant that seriously, it's a myth. There are interviews with various TKD grandmasters like Kim Soo or Hee Il Cho where they state the jumping kicks were added after they had already started practicing taekwondo.