How do I change the running animation when i am sprinting?

local speed = 60
local norm_spd = 40 
local ke_y = Enum.KeyCode.LeftShift 
local fovMax = { FieldOfView = 70 + (speed/5) }
local fovMin = { FieldOfView = 70 }
local thing = game.Workspace.CurrentCamera
local tween = game.TweenService:Create(thing, TweenInfo.new(0.4, Enum.EasingStyle.Sine), fovMax)
local tween2 = game.TweenService:Create(thing, TweenInfo.new(0.4, Enum.EasingStyle.Sine), fovMin)
local UIS = game:GetService("UserInputService")

UIS.InputBegan:Connect(function(input, processed)
   if processed then return end
   if input.UserInputType == Enum.UserInputType.Keyboard then

		if input.KeyCode == ke_y then
			game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = speed
			tween:Play()
   		end
	end
end)

UIS.InputEnded:Connect(function(input) 
	if input.KeyCode == ke_y then
		game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = norm_spd
		tween2:Play()
	end
end)

This is my code, how do I change the animation from walking (the normal animation) to my custom made running animation only when I am sprinting?

Put an animation into wherever you want but im gonna use ServerStorage and name the animation whatever you want but im just gonna call it animation and then do

local ServerStorage = game:GetService("ServerStorage") -- References ServerStorage

local Player = game.Players.LocalPlayer -- References the LocalPlayer

local Humanoid = Player.Character:WaitForChild("Humanoid") -- References the players humanoid

local Animation = Humanoid:LoadAnimation(ServerStorage.Animation) Animation.Play()

Now you're gonna have to make your own animation but just go into the plugins menu, select the rig builder, place down a r15 or r6 dummy, and then click on the animation editer, select the dummy.

Then you can start animating, just make a running animation (tip: You can go into the Home menu to get the moving and rotating options)

Once you're done, click the three dots on the top of the animation editer gui thing, then select export, Do the name and description of the animation, then upload it. Then go to the page where you uploaded it, copy the link. And paste the link into the animation (The actual animation, not in the code) Paste it in the AnimationId property.

Also, if this doesn't help, you can just watch a tutorial, there are lots of tutorial on animation.