Axe kicks are a little debatable as to whether or not they are actually effective as an offensive technique, and you often only really find them coming out towards the end of bouts as the combatants tire and their opponent’s defence lowers a little.
Because of the flexibility required to perform an effective axe kick, in other words striking directly on the collar bone, this kick is most associated with female fighters and the young, though there is nothing stopping a full grown man doing it every now and then.
Simple note though, don’t try it on someone who is taller than you, and most important of all, remember that this kick leaves you particularly vulnerable against someone who likes to move in to disrupt your techniques.
In other words, if you are too slow, expect to be lying flat on your back!