From what I have learned, spin hook kicks or jump spin hook kicks are only good if you are in supreme condition and know WTF you're doing, if you get what I mean. Not that I am any authority, but I mean, in reading about how such kicks are applied, you don't have to have a plan of attack and then set your opponent up so they thing something else is coming and they guard for it, only to get whopped with the spin hook kick. A jump spin hook kick through to the head will knock someone down most surely and can do serious damage. The thing is, like I said, you must know how to set up your opponent, then be able to spring off of the ground instantaneously and unleash your kick.
So for martial sports like taekwondo competitions, jump kicks are great. For more intensive martial sports, like Pride, UFC, and K-1, the only jump kick I would ever attempt is a jump-spin back kick.
For a streetfight, I can not see the need for ever needing a spinning hook kick, though the hook kick itself I still think one should have. But in a brawl you don't have the ability to set your opponent up since it is a brawl and not a competition match.
So for self-defense, I'd say the spinning hook kick isn't worth trying, though I think it is good if one can still do it.
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