How to check if player is in the air?

Hi, I am making a fighting technique for a game, and I was wondering how I could make the fighting technique not run if the player is in the air. So, how would I make a condition like this?

I tried using the code

if character.Humanoid.FreeFalling then return end

but the player wouldn't be able to run the fighting technique at all with this condition

I think there is an event called freefalling try something like this:

char.Humanoid.FreeFalling:connect(function()
	--code in here
end)

sorry if im wrong lol

Use event "FreeFalling".