Fe universal okarun

local Players = game:GetService("Players")
local player = Players.LocalPlayer
local backpack = player:WaitForChild("Backpack")

local tool = Instance.new("Tool")
tool.Name = "Run tool"
tool.RequiresHandle = false
tool.CanBeDropped = false

local animation = Instance.new("Animation")
animation.AnimationId = "rbxassetid://252557606"

local animTrack
local isRunning = false
local defaultSpeed = 16 -- Default humanoid WalkSpeed

tool.Activated:Connect(function()
    local character = player.Character
    if not character then return end
    local humanoid = character:FindFirstChildOfClass("Humanoid")
    if not humanoid then return end

    if isRunning then
        -- Turn OFF running
        if animTrack then
            animTrack:Stop()
            animTrack = nil
        end
        humanoid.WalkSpeed = defaultSpeed
        isRunning = false
        print("Run OFF")
    else
        -- Turn ON running
        animTrack = humanoid:LoadAnimation(animation)
        animTrack:Play()
        humanoid.WalkSpeed = 40
        isRunning = true
        print("Run ON")
    end
end)