how to detect if the player is moving?

I want to be able to figure out when the humanoid is moving, ive tried using Humanoid.Running but that only seems to fire twice(? correct me if im wrong) once when they start moving and once when they stop

        bp.Position = ((torso.CFrame * CFrame.new(petx, -1.5, 3)).Position)
        wait(1.5)
        bp.Position = ((torso.CFrame * CFrame.new(petx, 10, 0)).Position)