Running Script

local UIS = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer
local Character = Player.Character

local Deb = false
local KeyPressed = "X"

UIS.InputBegan:Connect(function(Input)
    if Input.KeyCode == Enum.KeyCode.X then
        if Deb == false then
            Character.Humanoid.WalkSpeed = 32
            Deb = true
        else
            Character.Humanoid.WalkSpeed = 16
            Deb = false
        end
    end
end)