Bhagavad Gita 6.13

6.13 Let him firmly hold his body, head and neck erect and still, gazing at the tip of his nose, without looking around.

One should hold one's body, neck, and head erect in a straight line and stare steadily at the tip of the nose. Thus, with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should meditate upon Me within the heart and make Me the ultimate goal of life.