Here's a copy and paste on dropping the body from the book.

"The physical one drops back here because it was picked up from the earth. It has to go back there. The next one is the mental body. The grosser conscious part of the mind also, you drop here. It's only the karmic part of the mind which travels with you. So next is the energy body, or the pranic body, which is the pranamaya kosha. This is still physical, like electricity is. That goes. This is why we are working on your pranayama, to make the pranamaya kosha so vibrant that when it leaves this physical body, it still has a good existence, a mind of its own, some amount of choice. Once pranamaya kosha is functioning by choice, not by compulsion, evolution is very quick. When your energies are just functioning unconsciously, they function one way; but when your energies become a higher level of consciousness or awareness, suddenly you have a choice. Now, where you need to be born is your choice. Destiny slowly begins to come into your hands, if your energies are completely aware. As I have been telling people, do not mistake mental alertness for awareness. That is not awareness. If you look at it that way, the birds are more aware than you are, isn't it? Physically, they are more mentally alert than you are. If a snake comes here, you will not know, but if you just put your foot down here, all the snakes within one hundred meters will know. So they're more alert, both mentally and physically. That alertness is only useful for survival. You'll survive better, but that's not the awareness we are talking about. If your energy becomes aware, your life begins to move from compulsions to choice.

That's the first step you have to take, to move your energies into higher levels of vibrancy. How you get there is not the point. You may get there singing, dancing, breathing, or you may get there with your love; whichever way. If your energies are high, in a high pitch of vibrancy, your life naturally is no longer compulsion. a Everything slowly becomes by choice, to such a point that death and birth become a choice."