It doesn't actually put u into labor it helps the baby drop down into position which could in turn help thin and dialaye ur cervix cause of the pressure
It helped me when I was in labour, I bounced on it for 5 mins, pain got too bad so I got back on the hospital bed, got a pain and then my waters went and my baby girl was born 1hr later. If I hadnt used the ball it probably would of been a couple of hours longer :-)
I believe it has to so with the engagement of the deep pelvic floor muscles which u would have to use on a ball BC its not stable in Any direction , a bed or couch is stationary so biomechanically I don't see it having the same effect
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My ball was like $13 @ Walmart several years ago.