Yoga asanas that turn the body upside down are known as inversions. Inversions will substantially support the efficient functioning of your immune system through the added power of gravity to increase circulation.
Seasonal Affective Disorder (SAD) is a form of depression that fluctuates with the seasons. It is most prevalent in areas of the world that receive little or no sunlight during the fall and winter seasons. The sun's rays and Vitamin D production from sunlight helps to keep our brain chemistry optimally balanced. When we don't get enough sunlight, serotonin and dopamine levels begin to fall. These are two critical neurotransmitters in the brain that keep our moods positive and healthy. Low levels of serotonin, dopamine and Vitamin D are some of the main causes of depression. Taking walks in the brief periods of winter sunshine is a great way to help boost your serotonin and Vitimin D levels. A walk of even ten minutes will help your body to produce enough Vitamin D for the day.
In Yogic teachings, breath is considered extremely important. The word Pranayama is a compound word. Prana means life force, and vital energy; it's the breath of life. Ayama means to control, restrain or hold. Pranayama could be translated as simply breath control, but there are a lot of subtle nuances in the word that are lost with such a simplified definition.