Why does this script make an NPC run only once?

script.Parent.Humanoid.StateChanged:connect(function(state)
	if state == Enum.HumanoidStateType.Running then
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle +0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle -0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle +0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle -0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle -0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle +0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle -0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle +0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle -0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle +0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle -0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle +0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle +0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle -0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle +0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle -0.05
		end
		wait(0.02)
	end
end)

I want to make it so that an NPC runs until the state has changed but this only makes it run once, how do I change it so that it runs until the state has changed?

--Er so I'm not sure about this and I'm at school so I cannot test it but if it doesn't work try giving me output

local running = false

coroutine.resume(coroutine.create(function()
	repeat wait(0.1) until running == true
	while running do
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle +0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle -0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle +0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle -0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle -0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle +0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle -0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle +0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle -0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle +0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle -0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle +0.05
		end
		wait(0.02)
		for i = 1, 6 do
			wait(0.01)
			rightarm.DesiredAngle = rightarm.DesiredAngle +0.05
			leftarm.DesiredAngle = rightarm.DesiredAngle -0.05
			rightleg.DesiredAngle = rightarm.DesiredAngle +0.05
			leftleg.DesiredAngle = rightarm.DesiredAngle -0.05
		end
		wait(0.02)
	end
end))

script.Parent.Humanoid.StateChanged:connect(function(state)
	if state == Enum.HumanoidStateType.Running then
		running = true
	else
		running = false
	end
end)

If this doesn't work try to give output or fix up what I'm forgetting. I have no way of testing this as of now so tell me how it works out!