Sneaking and Triggers

Hi there!

So i'm pretty new in this cool tool.

I want to make a Jetpack Enchant. I already know how to Create it, test for it and structurize it. It basically gives levitation as long as the player is sneaking. But i'm stuck with one thing.

How do i trigger this? No global trigger makes sense for "player sneaking". What can i do here? Maybe this player tick thing? What even does this trigger do? And does it eat up lots of resources?

Would be great if you could help me out!