Keeping your attention directed within your body during yoga practice, and learning to become aware of and able to subtlety articulate joints, nerves, tendons, and muscles is an invaluable and useful tool to keep the mortal coil, as the body has been called, working in high efficiency and well being.
Conversely, learning to withdraw from your body all conscious attention, feeling, and even bodily sensations, is an equally valuable and useful tool to cultivate. Savasana, the corpse pose, is where this ability is learned and practiced. During Savasana, practice disengaging your conscious awareness from your body—moving into silence and stillness. This ability can also be a useful tool in many forms of sitting meditation.