Meditation on Twin hearts is based on the principle that some of the major chakras are entry points or gateways to certain levels or horizons of consciousness. To achieve illumination or Cosmic consciousness, it is necessary to sufficiently activate the Crown chakra. But this can be done only when the Heart chakra is sufficiently activated. The Twin Hearts thus refer to the Heart and Crown chakras.
I have never been successful w/the whole"kundalini - start at the base of the spine" stuff altho - granted -- i am not very motivated or patient enough or something ... However, ....
when I have meditated with the focus of the energy coming forth from my heart and crown chakras (I usually begin by focusing my energy "expansion" as coming from the heart chakra (centered within the heart). I have had profound "at-one-ment" experiences which are usually accompanied by great elation. For what its worth ....