There is a whole science and technology to make the body evolve from being just a heap of food, just an accumulation of what we have taken from the earth, into something beyond flesh and blood, beyond the compulsions of our chemistry.
The body is the most sensitive and capable instrument on this planet. If you know how to use it, it can tell you everything that is here and beyond.
You must keep this ‘machine’ in a manner that it must be on for whatever it needs to do. Suppose it has to stay for three days without food or sleep, then it is not a compulsive process, it has become a conscious process. It will do just what you want it to do.
One simple release that this body needs is, if you can simply sit without being identified with the physical process that is on right now, not identifying this either as a man or a woman or as this or that, if you allow it to reverberate the way it should and can, it can become the very centre of the cosmos because there isn't one centre for this cosmic manifestation. The opportunity to become the very centre of the existence is always wide open to you.
This science of getting there, this dimension of making this happen to yourself is what we are referring to as yoga. But the reason why it looks so far away for many people is simply because they have tied their boat to one shore but are working hard to get to the other shore. How is it possible?
So, bending your body, holding your breath, all these acts will slowly cut the ropes of the physical and create a distance between you and the physical. Once there is a distance, rowing your boat away is very simple; just the water current or the breeze may do it. Even if you go to sleep, it may still make it to the other shore. If you row hard, you will definitely get there that much quicker.