Streach to improve axx kick?

What is the best streach to practice to improve my axx kick?

In my opinion, the front stretch kick is the best one... but also the simple bend down and touch your toes.

do you mean like a forward split kind of thing?

Dynamic leg raises are the best to increase the height of your axe kick. That's probably what joe means with the front stretch kick.
Bend down and touch your toes wouldn't affect it a lot since it's a different kind of flexibility.

cool thanks