Mental Kriya Pranayama with physical breathing

The next advanced level of practicing Kriya Pranayama is the one described here - this level should only be started after successfully realized all previous parts of Kriya Yoga and Kriya Pranayama to a successful level of achievement. It is the success of your previous Kriya Yoga practice that leads to the quietness and harmony within that is necessary to succeed as described here.

while previously you have been fully concentrating on OM into each described chakra and breathing regularly and normally - completely free of your Kriya Pranayama - NOW it is time to combine breathing and Kriya Pranayama.

To combine means: