About limitations and boundaries

Everybody knows these words and the meaning beyond. Because everybody has their own boundaries and limitations. It is that moment when some inner voice tells you "STOP" and you interrupt the activity you are doing right now. But why do we stop? Just because we know that this inner voice tells the truth? I think that mostly boundaries are connected to the fears within us and to our attachements. Fears are created by our experiences and environment. Attachement means that I am full of fear to lose something. But what will I lose? If I am too much attached to my body in yoga that could mean that I am afraid to loose it. That creates boundaries. So far...Let's transfer it to our yoga practice.