As you practice yoga, you are contracting and stretching the muscles at a cellualr, biomechanical level, allowing lipids and proteins to reorganize more optimally for better circulation. All nerves of the body are stimulated by this compression and extension of muscles, supplying fresh blood, oxygen and nutrients to the various systems of the body such as heart, lungs, veins, arteries, organs, tissues, muscles, etc., while flushing out waste products.

Bones are strenghthened because of the additional weight and stress applied when the postures are practiced routniely and appropriately. Blood and calcium, essential to health, are transported to the bones.

The brain is stimulated by improved circulation and the "controlled change" in blood pressure. Communication within the nervous system is improved. The lymphatic system works more effectively to carry fatty tissue from the intestines.

Immune system organ function is boosted. Compression and extension of thymus, spleen, appendix, and intestines help to keep them functioning properly. Endocrine glands are encouraged to secrete the appropriate hormones into the body. The communication of hormones among various glands and systems of the body are "perfected". Joints are strenghthened and lubricated, which can increase their range of motion (good for arthritis).

Your yoga practice balances the muscles, joints and energies of the body via the strength built and overall balance attained.