Candra: Glittering, shining, having the brilliancy or hue of light. Moon.
The sun and moon represent the two polar energies of the body. Hatha yoga is the physical practice to purify and prepare your body for meditation. HATHA can be divided into HA: solar energy and THA: lunar energy. Together "hatha" means forceful, communicating that powerful work is necessary to reach a higher state of being. So while the most important aspects of yoga do not concern the physical body, in the beginning you can't just sit on your a** to get 'there.'
To feel the proper alignment practice Ardha Chandrasana with your back body pressed up against a wall, it feels amazing even for the most developed practitioners.
Have both legs so strong you could stand on either foot.
"Yoga" "yolks" the sun and moon energies and by joining them together creates balance and strength inside you.
"When force of circumstance upsets your equanimity, lose no time in recovering your self-control, and do not remain out of tune longer than you can help. Habitual recurrence to the harmony will increase your mastery of it." –– Marcus Aurelius
Physical yoga, including balancing and strengthening full-body poses such as Ardha Chandrasana, will help you to recover your self control and return to your harmony.