The American Pregnancy Association recently sited the Alexander Technique as helpful in the natural birthing process.
The Alexander Technique:
F. M. Alexander (1869-1955) developed this technique for sitting, standing and moving with safety, efficiency, and ease after solving his vocal trouble. Not only pregnant women, but all people can learn to release muscular tension, increase breathing capacity and restore the body’s original poise and proper posture. As your body changes, lower back pain, balance, digestive problems, shortness of breath can be helped through simple modifications in your movement. When it is time to deliver you will be able to breathe, and calm your system, focus during the birth, help open the cervix during dilation and prepare for effective pushing as the baby comes.
See full article here: http://www.americanpregnancy.org/labornbirth/naturaldeliverytechniques.html
For recommended reading on the Alexander Technique and pregnancy, please see my recommended reading page here.