FE Script plays an animation but it doesn't stop it. Why?

Hey. I want to do a Crouch System that when I press C it plays an Animation and when I press it again it stops playing the animation. It does play the animation but for some reason it doesn't stop it. No errors appear in the Output. The system is Filtering Enabled.

Script:

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local crouchOnEvent = Instance.new("RemoteEvent", ReplicatedStorage)
crouchOnEvent.Name = "CrouchOnEvent"
local crouchOffEvent = Instance.new("RemoteEvent", ReplicatedStorage)
crouchOffEvent.Name = "CrouchOffEvent"

local animation = Instance.new("Animation")
animation.AnimationId = "http://roblox.com/asset/?id=1276087541"

local function onCrouchOnFired(plr)
	local char = game.Workspace:FindFirstChild(plr.Name)
	local humanoid = char.Humanoid
	animTrack = humanoid:LoadAnimation(animation)
	animTrack:Play()
end

crouchOnEvent.OnServerEvent:Connect(onCrouchOnFired)

local function onCrouchOffFired(plr)
	local char = game.Workspace:FindFirstChild(plr.Name)
	local humanoid = char.Humanoid
	animTrack = humanoid:LoadAnimation(animation)
	animTrack:Stop()
end

crouchOffEvent.OnServerEvent:Connect(onCrouchOffFired)

Local Script:

local UserInputService = game:GetService("UserInputService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local crouchOnEvent = ReplicatedStorage:WaitForChild("CrouchOnEvent")
local crouchOffEvent = ReplicatedStorage:WaitForChild("CrouchOffEvent")

crouch = false

local function crouchOn(inputObject, gameProcessed)
	if inputObject.KeyCode == Enum.KeyCode.C and crouch == false then
		crouchOnEvent:FireServer()
		crouch = true
	end
end

UserInputService.InputBegan:Connect(crouchOn)

local function crouchOff(inputObject, gameProcessed)
	if inputObject.KeyCode == Enum.KeyCode.C and crouch == true then
		crouchOffEvent:FireServer()
		crouch = false
	end
end

UserInputService.InputBegan:Connect(crouchOff)

Fixed it. This is how:

local UserInputService = game:GetService("UserInputService")
local character = game.Players.LocalPlayer.Character
local humanoid = character.Humanoid

animation = Instance.new("Animation")
animation.AnimationId = "http://roblox.com/asset/?id=1276087541"
animTrack = humanoid:LoadAnimation(animation)

UserInputService.InputBegan:Connect(function(key)
	if key.KeyCode == Enum.KeyCode.C then
		animTrack:Play()
	end
end)

UserInputService.InputEnded:Connect(function(key)
	if key.KeyCode == Enum.KeyCode.C then
		animTrack:Stop()
	end
end)