Ultra speed

for _, part in next, game.Players.LocalPlayer.Character:GetChildren() do
  if part:IsA("BasePart") then
     part.CustomPhysicalProperties = PhysicalProperties.new(math.huge, 0, 0, 0, 0)
     part.EnableFluidForces = false
     pcall(function()
      sethiddenproperty(part, "Friction", -math.huge)
     end)
    part.Massless = false
  end
end

game.Players.LocalPlayer.Character.Humanoid.FallingDown:Connect(function()
  game.Players.LocalPlayer.Character.Humanoid:ChangeState("GettingUp")
end)

local tool = Instance.new("Tool", game.Players.LocalPlayer.Backpack)
tool.Name = "Stop moving"
tool.RequiresHandle = false

tool.Activated:Connect(function()
  game.Players.LocalPlayer.Character.Humanoid:ChangeState("GettingUp")
  for _, part in next, game.Players.LocalPlayer.Character:GetChildren() do
    if part:IsA("BasePart") then
      part.Velocity = Vector3.zero
      part.AssemblyAngularVelocity = Vector3.zero
      part.AssemblyLinearVelocity = Vector3.zero
    end
  end
end)

local BF = Instance.new("BodyForce", game.Players.LocalPlayer.Character.HumanoidRootPart)
task.spawn(function() 
 repeat task.wait()
   if game.Players.LocalPlayer.Character.Humanoid:GetState() ~= "Running" and game.Players.LocalPlayer.Character.Humanoid:GetState() ~= "RunningNoPhysics" and game.Players.LocalPlayer.Character.Humanoid.MoveDirection.Magnitude <= 0 then
      BF.Force = Vector3.zero
     else
      BF.Force = game.Players.LocalPlayer.Character.Humanoid.MoveDirection * 1e9 -- you can change it
    end
  until not game.Players.LocalPlayer.Character 
end)