1. Bhagavad-Gita As It Is. Chapter 6 Text 10-17
Process of Astanga-Yoga and it’s rules and regulations.

2. Text 10 : Real renunciation.
“A transcendentalist should always engage his body, mind and self in relationship with the Supreme; he should live alone in a secluded place and should always carefully control his mind. He should be free from desires and feelings of possessiveness.”
“When one is not attached to anything, but at the same time accepts everything in relation to Kåñëa, one is rightly situated above possessiveness. On the other hand, one who rejects everything without knowledge of its relationship to Kåñëa is not as complete in his renunciation.”

3. Accepting and rejecting
He should be very careful to accept favorable and reject unfavorable conditions that affect his realization.
“When one is not attached to anything, but at the same time accepts everything in relation to Kåñëa, one is rightly situated above possessiveness. On the other hand, one who rejects everything without knowledge of its relationship to Kåñëa is not as complete in his renunciation.”

4. Text 11-12
“To practice yoga, one should go to a secluded place and should lay kuça grass on the ground and then cover it with a deerskin and a soft cloth. The seat should be neither too high nor too low and should be situated in a sacred place. The yogé should then sit on it very firmly and practice yoga to purify the heart by controlling his mind, senses and activities and fixing the mind on one point.”

5. Most practical meditation for Kali-Yuga
One who is not self-controlled and whose mind is not undisturbed cannot practice meditation.
harer näma harer näma
harer nämaiva kevalam
kalau nästy eva nästy eva
nästy eva gatir anyathä
“In this age of quarrel and hypocrisy the only means of deliverance is chanting the holy name of the Lord. There is no other way. There is no other way. There is no other way.”

6. Text 13-14
“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.”

7. Strict rules of Yoga practice
Freedom from sex life by following Brahmcarya.
Householder brahmacäré
Householder brahmacäré may be accepted in the bhakti school, but the jïäna and dhyäna schools do not even admit householder brahmacärés. They require complete abstinence without compromise.
Vigata-bhéù. One cannot be fearless unless one is fully in Kåñëa consciousness.
karmaëä manasä väcä
sarvävasthäsu sarvadä
sarvatra maithuna-tyägo
brahmacaryaà pracakñate
“The vow of brahmacarya is meant to help one completely abstain from sex indulgence in work, words and mind—at all times, under all circumstances, and in all places.”

8. Text 15
“Thus practicing constant control of the body, mind and activities, the mystic transcendentalist, his mind regulated, attains to the kingdom of God [or the abode of Kåñëa] by cessation of material existence.”
tam eva viditväti måtyum eti: “One can overcome the path of birth and death only by understanding the Supreme Personality of Godhead, Kåñëa.”

9. Text 16-17
There is no possibility of one’s becoming a yogé, O Arjuna, if one eats too much or eats too little, sleeps too much or does not sleep enough.
He who is regulated in his habits of eating, sleeping, recreation and work can mitigate all material pains by practicing the yoga system.

10. Regulations in eating and sleeping.
Bhuïjate te tv aghaà päpä ye pacanty ätma-käraëät. Anyone who eats for sense pleasure, or cooks for himself, not offering his food to Kåñëa, eats only sin.
One who eats more than required will dream very much while sleeping, and he must consequently sleep more than is required.
Thus regulation in all respects is must for any Yoga practice.