Sri M said....

‘Shakti’ or Energy operates within seven centers in the human psyche. It starts with the lowest one at the end of the spine called the Muladhara Chakra, and goes up through to the other six centers, with the last one in the cerebrum called Sahasrara Chakra, the thousand-petaledlotus. The idea is that the Energy is activated from the lowest and is slowly guided up through the spine, Sushumna till it reaches the top of the head, the Sahasrara Chakra.