local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")

local function updateHealthBar(damage)
    local healthRatio = humanoid.Health / humanoid.MaxHealth
    script.Parent.Position = UDim2.new(0.5 - healthRatio / 2, 0, 0.5, 0)
    script.Parent.Size = UDim2.new(healthRatio, 0, 1, 0)
    script.Parent.AnchorPoint = Vector2.new(0.5, 0.5)
end

humanoid.HealthChanged:Connect(updateHealthBar)