To see what the "flipping" procedure involves, read more.
Medically speaking, external cephalic version is defined as:
A procedure used to turn a fetus from a breech position or side-lying (transverse) position into a head-down (vertex) position before labor begins.
During this procedure, doctors try to flip the baby while the uterus is relaxed. Using both hands, the doctor attempts to turn the baby by placing one hand by the fetus's head and the other by the rear. An external technique, women often experience pain and bruising as the medic typically has to use quite a bit of force for the version to occur. However, many women feel the pain is worth it if they can experience a "normal" vaginal birth.
According to WebMD, version is only successful about 58 percent of the time.