Play is a powerful tool. For children, it helps their minds create connections between neurons, helps them promote development of coping mechanisms, and lets them experience different interactions in a safe and controlled manner. It is a major part of how they learn to navigate the world around them.
For adults, it has different, but no less important, purposes. When adults play, they are able to let go of daily stresses and be present in the moment, if only briefly. This can be extremely difficult when you have responsibilities at work, dependents at home, and things need to get done. What are you doing playing when you have so many things to do?!
When we, as adults, allow ourselves to release our stresses and interact with our bodies and environments freely, our brains are able to move the fast pace and constant stimulus to the back burner and just be.