The Yoga Sutras offers a clear roadmap for the evolution of consciousness from ordinary states of awareness such as waking, dreaming, and sleeping to higher states of consciousness. Routinely as you practice, yoga takes shape within you. If you do any yoga asana sweat must pour out from the top of your head and not all over the body. The rest of the body may sweat according to weather conditions, but the main sweating should happen from your head. That means you are directing your energy in the right direction, and the asanas will naturally do that. Ultimately, you want to become a fountain head of something else, so you first practice with waste water. If you keep working up your ushna (heat), it will naturally take the waste water upward. If your system gets too hot, slow it down with a little bit of shavasana, but never reduce the heat with cold water. You should sweat it out rather than going to the bathroom because the level of purification is much higher when the waste water comes out as sweat.
During practice, if you are dripping with sweat, usually your attire will soak it up. But if you are bare-bodied, always rub the sweat back into the body because there is a certain element of prana (energy) in the sweat, which we do not want to lose. When we rub the sweat back into our system, it will create a certain aura and strength for the body a cocoon of your own energy which is also known as kavacha. We do not want to flush this down the drain. Yoga is about using the body to its maximum benefit. If you do asanas regularly and you rub back your sweat into body, you will generate a certain level of ushna and pranic intensity. Hot weather, cold weather, hunger or thirst, not that you are completely free from it all but these will not bother you as much.
The idea is to slowly grow beyond your physical compulsions. Whether it is food, drink, bathroom, or whatever else, the level of a particular compulsion is different from person to person but the physical is a series of compulsions. The idea is to reduce the compulsions gradually so that one day, if you sit, you become yoga and not just practicing yoga. To become yoga means that your level of perception is such that there is no distinction between you and the universe. We become one microcosm while nature is the macrocosm. In essence we are one Indivisible whole…..