I am a Purple Belt in the Jhoon Rhee system of Tae Kwon Do. Recently I had a discussion with a couple of my friends that practice Aikido, Hapkido, and other Arts. They claim TKD is not as effective because it does not focus on using the opponents energy in order to defeat him/her but that we try to kick to high, and jump too much! . Is that so?..What do you guys think?