local ContextActionService = game:GetService("ContextActionService")
local Players = game:GetService("Players")

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

local walkSpeed = 16
local sprintSpeed = 30

local function handleSprint(actionName, inputState, inputObject)
	if inputState == Enum.UserInputState.Begin then
		humanoid.WalkSpeed = sprintSpeed
	elseif inputState == Enum.UserInputState.End or inputState == Enum.UserInputState.Cancel then
		humanoid.WalkSpeed = walkSpeed
	end
end

ContextActionService:BindAction("Sprint", handleSprint, true, Enum.KeyCode.LeftShift, Enum.KeyCode.RightShift)