The front toe kick in this clip is very good. If you stop at 0.07, you can see that his toes was up and then pressed down. The kicking path is a "downward curve". It's not easy to be able to develop a kick like that.
http://www.youtube.com/watch?v=Wt83nvRwq-4
Compare to the following clip that:
- bend knee,
- fold lower leg and upper leg, and
- extend lower leg,
http://www.youtube.com/watch?v=r-0gF...feature=relmfu
The execution is complete difference. The kicking path is an "upward curve". The missing part is
- raise toes up.
- press the toes down and forward, and
- kick with the ball of the foot.