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-- Place this script inside a LocalScript in StarterPlayerScripts

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

local isSprinting = false
local walkSpeed = humanoid.WalkSpeed
local sprintSpeed = 2 * walkSpeed -- You can adjust the sprint speed multiplier here

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local function onKeyPress(input)
    if input.KeyCode == Enum.KeyCode.LeftShift then
        isSprinting = true
        humanoid.WalkSpeed = sprintSpeed
    end
end

local function onKeyRelease(input)
    if input.KeyCode == Enum.KeyCode.LeftShift then
        isSprinting = false
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        humanoid.WalkSpeed = walkSpeed
    end
end

userInputService.InputBegan:Connect(onKeyPress)
userInputService.InputEnded:Connect(onKeyRelease)

pastebin shirft