In many social environments, boasting about ourselves is usually frowned on. It is often impolite to keep going on about our own achievements and show off our skills, processions and knowledge. This leads to a certain amount of conformity where we never get to praise ourselves. We are encouraged to praise others (rightly so) and everyone loves to be praised. However, we never get to acknowledge our own achievements internally. In fact, most often we are so focused on learning or owning the next thing that we forget we have come a long way already.
This lack of self-praise can lead people to devalue themselves and not see their own accomplishments as significant or worthy of sharing with others. This can in turn lead to reduced self-esteem and life-worth. Hence, it is useful to have an opportunity to self-praise in front of others.
In this elegant but powerful exercise, delegates get to praise themselves in a controlled environment so there is no room to appear rude or impolite. They get to acknowledge their own accomplishments and feel good about themselves by sharing this with others. It is this sharing aspect that makes this exercise so powerful by encouraging people to talk about themselves positively while having someone to listen to. It simply reminds people that they have done well, focusing their attention on the most positive aspects of their lives.