I remember comparing my first labour to being kicked in the back really hard by a horse I've never been kicked by one but how I would imagine it felt, over and over, had 2 hour labour start to finish though..
Second one, got induced, 4 hour start to finish. More like massive aching pains in Lower back that progressively got worse to the point where there was no break in the pain, it was constant and I was overwhelmingly hot!