In most ancient traditions every human is more or less a balance of both masculinity and femininity. In modern scientific terms we can express this as positive and negative charges. We see this in magnetics with north and south poles, This inherent duality exists in all of nature: active/calm, expanding/contracting, giving/receiving. In the Yogic tradition we see numerous depictions of Shiva/Shakti half God half Goddess. The Chinese tradition calls these Yin Yang. With regards to our Yoga Sadhana, especially at first when we work with the postures, we must learn to balance these energies so that our physical, mental, energetic, environmental, social and spiritual states are in equilibrium and in alignment with Dharma. This put simply signifies that if we practice with lots yang or restless intensity, called Rajaguna in Yogic terms, we will overly excite our desires and burn out our system. Conversely if we are too soft and let gravity do our work, we encourage too much Yin or Tamoguna resulting in low energy states, negative attitude and a lack in circulation. To achieve Sattoguna the mode of peace and goodness, we must eventually balance these dynamics, only then will our meditation, service and devotion be true.