How to detect when a player is moving?

So I was playing one of those speed city games and I though I could probably make one of those so I tried to make a moving detection script cause thats pretty much the entire game lol but I cant get mine to work, I know there are plenty of easier ways to make one compared to mine but I dont understand them that well (Basically I would need a really in depth explanation) , but here's mine I also placed the script in the StarterCharacterScripts

local moving = false -- Moving Variable

function movingdetection() -- Function for detecting when player is moving
    if script.Parent.Humanoid.MoveDirection == Vector3.new(0,0,0) then   -- Checking if they are moving in any direction
        local moving = false
    else
        local moving = true
    end

end

while true do -- Loop for constantly calling the moving detection function
    print("ok then")
    movingdetection() -- Calling the function
    if moving == true then -- Seeing if the player moving comes back true
        print("moving") -- To show that its working 
    end
    wait(0.5)
end