This is the process. First of all you have to select a nice place, solitary place and you have to execute alone. Not that you go to a yoga class and pay your fees and make some gymnastic and come back home and do all nonsense. You see? Don't be entrapped by all these ridiculous things. Simply such society I can declare, is the society of the cheaters and the cheated. You see? Here is the practice. Here you can see. And spoken by the supreme authority, Kṛṣṇa. Is there any person better yogi than Kṛṣṇa?
Here is the authoritative statement. That you have to practice like this. Now, one should hold one's body, first of all you have to select your place, holy place, alone, and special seat. Then you have to sit straight like this. "One should hold one's body, neck and head erect." Straight line. This is the yoga process. These things help to concentrate the mind. That's all. But the real purpose of yoga is to keep Kṛṣṇa always within yourself.