Chakra Hand Postures -- these mudras and bijas (seed sounds) have real physiological basis--they help us to propriocept in our physical bodies where there are restrictions or blockages that prevent prana (life force) from flowing freely into and throughout the body and can actually remove these restrictions.
"When we care for others our own strength to live increases. When we help people expand their state of life, our lives also expand. Actions to benefit others are not separate from actions to benefit oneself. Our lives and the lives of others are ultimately inseparable." ~Ikeda