Active birth is a way to work with birth physiology. In labour a woman is encouraged to move and change her position freely. Using upright positions harnesses gravity to help with the progress of labour. Movement helps with baby's position and a woman's comfort in labour. This video clip by Penny Simkin demonstrates slow dancing as an active birth technique. Couples can use "slow dancing" during labour to help labour progress, decrease discomfort and assist with rotation of the baby.