Summarize how playing helps children. 

For young children, play is often a full body activity that helps them develop skills they will need later in life. Running, dancing, climbing, rolling—these activities all foster muscle development and help fine-tune motor skills. Children also build their mental and emotional muscles as they create elaborate, imaginative worlds rich with a system of rules that govern the terms of play.

University of Denver researchers Elena Bodrova, Carrie Germeroth, and Deborah J. Leong found that children teach themselves to regulate their emotions and think before they act when they play. For example, if a child is pretending to be Olaf from Frozen, they may pretend they’re melting when they come inside or insist that they like warm hugs. In each case, they consider how their actions will correlate with how Olaf should act in a given situation.

This role playing helps children build social skills and helps them become the kind of adults who are able to thrive in a range of personal and professional environments.
Playing helps children's muscle development and fine-tune motor skills because of the full-body movement. They're also improving their mental and emotional skills as they create imaginative worlds with set rules of how to act in real and pretend situations. They're learning to regulate emotions, thinking before they act, and building social skills as they role-play with others. 