Bob Hughes suggests that through his observations and research of animals and children playing that there are over 16 different play types and children need to test the boundaries in each one of those types in order to learn the rules of engagement in life for when they grow, mature and develop.
If a child has had the opportunity to push their physical boundaries, to balance, to climb, to move, to stretch, to throw, to jump and swing then there will be enhanced levels of physical and emotionally literacy in that child.
If children have been given an opportunity to test the boundaries of communication, by trying out words, sentences and intentions in a safe, environment, then they will develop the ability to become confident in offering their own opinions and thoughts later in life when it become important that they do.
If children are able to explore social boundaries, and understand that they are able to make and set their own in certain circumstances, then they will be more accepting of those boundaries set by others as they grow, they will also gain the ability to question them, and to follow them and as such put themselves into a place of greater safety, socially, emotionally and physically later in life, where the risk of physiological and psychological harm could be greater.
If a child has developed a sense of self worth and self awareness, then it is very easy for that child to make rational and balanced decision as as they grow as they have a strong foundation of a sense of self, a place in the world, confidence and resilience.