Body - Mind - Heart - Spirit
Since the days of cave man and cave woman, people have been meditating on the elements. Each element can be focused on individually or all can be understood together, but the emphasis is the same: we are composed of and interactive with elements every moment. This realization is true self-discovery. The meditation techniques themselves are very elemental:
Identify yourself with prana and extend infinitely as pure blissful consciousness.
The Meditation Society of America