In addition to learning to associate with the seer who sees beyond the fabrications of the mind, one of the primary reasons for the physical postures of yoga is to prepare the body for meditation and stillness. The physical practices open more space in the body, allowing prana to flow and support the chakras. If you intend to be still for a while in meditation, adding physical movement to your day helps counteract the effects of sitting still, which can create stiffness and unhealthy holding patterns in the muscles.