chelle, the trick is to have the woman sitting in a chair and push her knees firmly into the chair (i.e. horizontally not pushing them down). Tried it on a mum a couple of weeks ago, who then wanted me to do it the whole labour - lucky her partner was helping too, my wrists were wrecked - but it worked well. She got to 8cms with such composure, no drugs and posterior bub, but was told she was 10cms and the midwife had her pushing so you can imagine what happened there...