Easy Solution to Running Faster and Faster Assignment

--[[
    This script is simpler; it forever increases the speed but resets when the player stops and
    resumes walking.
--]]

local player = game.Players.LocalPlayer
local hum = player.Character:WaitForChild("Humanoid")

local WALK_SPEED = 16 -- Beginning walk speed
local INCREASE = 0.5 -- How much it accelerates each time
local INTERVAL = 0.1

local isRunning = false -- Whether the humanoid is running

hum.Running:Connect(function(speed)
    if speed == 0 then
        isRunning = false
    elseif not isRunning then -- When the player is just starting to run
        isRunning = true
        hum.WalkSpeed = WALK_SPEED
    end
end)

while wait(INTERVAL) do
    hum.WalkSpeed = hum.WalkSpeed + INCREASE
end