i try and do this (TMI) when im straining for a poo and my tummy hurts so bad (seeming i havent been in labour yet).. tho it doesnt work for me :P
Now I know this is a little off topic. BUT you know when ask or are told what labour feels like & the standard answer is period pain but worse. Well I don't get period pain so never knew what the hell they were going on about. Then I had a baby.
Then after said baby I had the same (TMI) pain when straining to do a poo. THAT pain in your stomach to me is the closest you will get to what to expect out of labour pain. Obviously a contraction is worse but the pain is the same if you ask me.