How to rotate torso according to lookVector?

So i have localscript here:

local RunService = game:GetService("RunService")
local Players = game:GetService("Players")

local Player = Players.LocalPlayer
local Camera = workspace.CurrentCamera

local Character = Player.Character or Player.CharacterAdded:Wait()
local LowerTorso = Character:WaitForChild("LowerTorso")

RunService.RenderStepped:Connect(function(deltaTime)
	local lookVector = Camera.CFrame.LookVector

	if lookVector.Y > 0.1 then
		print("Looking Up")
	elseif lookVector.Y < -0.1 then
		print("Looking Down")
	end
end)

I am trying to apply lean LowerTorso up and down but im stuck on part where i have to use lookVector, do i have to conver lookVector to orientation for such thing? if so how? or if not how else can i achieve this? thanks for reading!

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