Shift To Run

local char = script.Parent
local hum = char:WaitForChild("Humanoid")

local uis = game:GetService("UserInputService")

local running = false

function setSpeed()
    if running == true then
        hum.WalkSpeed = 32
    else
        hum.WalkSpeed = 16
    end
end

uis.InputBegan:Connect(function(input, isTyping)
    if not isTyping then
        if input.KeyCode == Enum.KeyCode.LeftShift or input.KeyCode == Enum.KeyCode.RightShift then
            running = true
            setSpeed()
        end
    end
end)

uis.InputEnded:Connect(function(input, isTyping)
    if not isTyping then
        if input.KeyCode == Enum.KeyCode.LeftShift or input.KeyCode == Enum.KeyCode.RightShift then
            running = false
            setSpeed()
        end
    end
end)