Chakras regulate energy. Like revolving doors or whirling vortex they unite the inner spirit with the physcial world radiating out from your spinal cord.They form the energic system which like your nervous and circulatory systems networks throughout your body. Any disturbance in the core enrgy of yur spine affects your arms, legs and head.
Yoga poses or postures are called asanas. They open your energy pathways, so chi or life force flows smoothly. Specific asanas are prescribed to balance the flow and correct minor maladies.