Taekwondo demonstration-style kicks are truly awesome, but trust me, much harder to perform than they look.
I’ve watched many students try 540’s and 720’s without even knowing what they mean, much less how to do them.
Here’s a quick guide on how to count the rotations of a jumping spin kick:

So how to do a 720 (4 half-spins)? It’s simple when you break it down: