It is because of our idea – we already have the idea that pain is no good throughout our life.
Check for yourself – the whole day long, whenever there is a little pain, we move the body. It has become a habit.
The mind resists pain because we don’t really understand what pain is. Yogis have been watching pain again and again – what have you learned from the pain?
As we grow older and older, the body will experience more aches and pain. If we understand anything about pain, the mind will react less whenever pain arises.