-- local script 

local player = game.Players.LocalPlayer

​

local flying = false

​

local function fly()

    if flying then

        flying = false

        player.Character.Humanoid:ChangeState(Enum.HumanoidStateType.Landed)

    else

        flying = true

        player.Character.Humanoid:ChangeState(Enum.HumanoidStateType.Flying)

    end

end

​

game:GetService("UserInputService").InputBegan:Connect(function(inputObject, gameProcessedEvent)

    if inputObject.KeyCode == Enum.KeyCode.Space then

        fly()

    end

end)