During one of the classes at Yoganusasanam in Pune in December 2015, Geeta S. Iyengar was giving a small talk about the ego and its emergence in asana.
In asana besides body, mind and intelligence we do also invite the ego (ahamkara). But there are two types of ego. Asmita represents the subtle form and it comes to the surface as "I am there", while the gross form of the ego emerges as "everything belongs to me".
Thus, during our asana practice when you take everything for granted and thoughts arise such as "I am doing everything (in the asana)", "I have done everything (in the asana)" or "I know everything (about this asana)" then you are caught in and by your ego.
“..in your body, which is your own universe, you have to be there in it. You have to watch everything.”
Geeta S. Iyengar
But once you work from the inside of your body, and you are experiencing the asana from inside, then you are feeding the I-consciousness in the sense of total awareness such as "I am there in the asana, I am existing everywhere".