Animation won't stop when the player isn't moving?

I'm trying to get an animation to not play when the player is standing still, but I can't seem to get it to work.

spawn(function()
	local Event = Human.Running:Connect(function(speed)
		if speed < 0 then
			RunningAnimation:Stop()
		elseif speed > 0 and not RunningAnimation.IsPlaying and Running then
			RunningAnimation:Play()
			print(speed)
		end
	end)
end)