This movement is śrī-caitanya-mano-'bhīṣṭam. Śrī Caitanya Mahāprabhu, He appeared on this earth five hundred years ago in Bengal, Navadvīpa, to spread this Kṛṣṇa consciousness, although this movement is not new. This Kṛṣṇa consciousness movement was started by Kṛṣṇa Himself. Apparently, the Kṛṣṇa consciousness movement was started by Kṛṣṇa Himself in the Battlefield of Kurukṣetra five thousand years ago, and He says that "This Kṛṣṇa consciousness movement I spoke to the sun-god long, long years ago." Imaṁ vivasvate yogaṁ proktavān aham avyayam (BG 4.1). This is avyaya. Avyaya means which is never diminished or destroyed. Vyaya means which is destroyed, and Kṛṣṇa says this yoga system . . . This is yoga system: bhakti-yoga. Yoga means to connect, to add, yoga. So at the present moment we are almost disconnected. Not exactly disconnected; forgotten our relationship with Kṛṣṇa, or God.
God means Kṛṣṇa, and Kṛṣṇa means God. So in the human society there are many different types of yoga system just to reconnect our relationship with Kṛṣṇa. In the Bhagavad-gītā they are explained differently: karma-yoga, jñāna-yoga, haṭha-yoga, dhyāna-yoga, bhakti-yoga. All of them are yogas, but there are different stages. Yoga means to connect, or to link up, with the Supreme Absolute Truth. Now suppose he is in the topmost platform. So everyone is trying to go there. Mama vartmānuvartante manuṣyāḥ pārtha sarvaśaḥ (BG 3.23). Kṛṣṇa says, "Everyone is trying to come to Me, but . . ." Just like the person who's on the top floor. So the staircase is one. Somebody has crossed ten steps; somebody has taken, crossed twenty steps; somebody has crossed hundred steps; but one has to go, to fulfill, say, one thousand steps. So there are different yoga systems. Everyone is trying to go to the topmost platform, mama vartmānuvartante manuṣyāḥ pārtha sarvaśaḥ. This is a fact.
So in the Kali-yuga especially, to come to the highest platform of yoga perfection step by step, it is little difficult. Actually, to practice yoga, one has to undergo so many austerities, penances, rules, regulations. That is all described in the Sixth Chapter of Bhagavad-gītā, how yoga should be practiced. It is recommended that yogīs should sit down in a secluded place, sacred place. So in India, still, those who are actually yogīs, at least those who are trying to follow the yoga system . . . Real yoga system means dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Yoginaḥ, those who are yogīs, they sit down in a secluded place, alone. This yoga practice is not possible in a fashionable city. That is not possible. It is to be executed alone. Still you'll find in India, many places—Haridwar—there are many yogīs, they are sitting alone. They have nothing to do with this material world, and dhyānāvasthita, and not only for one, two, three years, but for many hundred years. Still many yogīs come during Kumbha-melā. Their age is three hundred years, four hundred years, five hundred years old. It is possible. It is possible by exercising the breathing, one can prolong his life. That is called samādhi. If you can stop your breathing, then you enhance your duration of life. That is possible. Therefore you'll find the picture of the yogīs, they are controlling the breathing. Because everyone has got a destined breathing period by superior arrangement, so if you don't spend your breathing, then you'll prolong your life. This is the system. If you can remain in samādhi, don't breathe, then . . . Just like if you have got a bank balance, one thousand dollars. If you don't spend it, then the one thousand dollar is there. Or out of one thousand dollars, you spend one; still you have nine hundred ninety-nine. So the yoga practice is to control the breathing period. And this breathing can be controlled if you can control your sense pleasure. Otherwise it will not be possible. Especially sex. Everyone has got experience. While sex life one enjoys, the breathing is very heavy. Very, very heavy. So he loses the balance of his breathing period. Therefore the first practice of yoga is yoga indriya saṁyamaḥ, to control the senses. That is all described in the Bhagavad-gītā, Sixth Chapter.
So this yoga system was possible in the Satya-yuga, I mean to say, possible for the mass of people. If one or two person practices yoga, the practice is there, the system is there, but it is not possible for the general public. It is not possible. So in the śāstra we find, kṛte yad dhyāyato viṣṇuḥ (SB 12.3.52). Real yoga system, I've already explained, that yoga indriya saṁyamaḥ, or by meditation to see the Supreme Lord always within the heart. Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). In trance, you'll find yogī picture, their trance, they are in meditation, completely silent, stop breathing and seeing the Supreme Personality of Godhead, Viṣṇu, within the heart. This is actual yoga system. But it was possible to be executed in the Satya-yuga. Satya-yuga means when people used to live for one hundred thousands of years. That was possible. Just like Vālmīki Muni. He executed yoga system for sixty thousand years. Because he was to live for one hundred thousands of years, so it was not very difficult to engage oneself in sixty thousands of years. But that is not possible in this age.