MerKaBa is centered at the base of the spine and has a direct effect on the kundalini energy that is also housed there. According to the Vedic understanding of the 'Kundalini Energy', it is coiled like a serpent' 3 & 1/2 times at the coccyx and under certain conditions will rise to the top of the body in an 'awakening' experience.
It essentially means that this dormant energy flows freely up the spine and has a positive effect on the various chakras centers of the body. The MerKaBa facilitates this process of kundalini awakening by aligning the energy fields in that location and facilitates greater movement of energy throughout the body. It also opens blocked channels and cleanses the chakra points.
Spherical Breathing is the process of taking energy in directly through the prana tube and sending out through the navel/heart is known as spherical breathing. It involves taking the prana (ether) from the Cosmos and the Earth through the crown of the head and the base of the body (perineum) simultaneously and combines them in the navel/heart area into a small sphere of light. Then it continue to radiate out from the navel/heart into a larger sphere that surrounds the body. Hence the "spherical" sensation of this energy flow. This method of taking energy directly into our bodies (not from a secondary source such as food) is utilized by dolphins, whales and individuals who choose to fast or not eat food at all.... known as breatharians.