Shift to Sprint

local Input = game:GetService("UserInputService")
local Humanoid = script.Parent:WaitForChild("Humanoid")
local runningSpeed =
local walkingSpeed =

Input.InputBegan:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.LeftShift then
        Humanoid.WalkSpeed = runningSpeed
    end
end)

Input.InputEnded:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.LeftShift then
        Humanoid.WalkSpeed = walkingSpeed
    end
end)