Kids, by nature, are busy and active they seem to be always on the go Play stimulates physical and social skills in the young children.  Children need time to just play and be kids.
Parents should give children support and let them have uninterrupted space of time for them to have free play also to encourage them by providing equipment and materials for them to experience various kinds of play, such as, blocks, tinker toys, sand, clay, chalk, paint, coloring books, dress up clothes for pretend play. Hoops, balls etc. etc.
Parents should encourage kids to participate in all kinds of sports.  A playground at a park is a wonderful place to take young children where they have such a variety of play equipment to enjoy.
It is unfortunate, in this world today that children are much more restricted in their outside free play.  Parents are afraid for their safety and tell them not to roam their neighborhood alone.  When both parents work we now have latchkey children who either stay indoors or are enrolled in an after school program.  Studies by various organizations say the average American child spends roughly 30 hours a week watching TV and over 75% of children play video games and spend 3-4 hours a day on computers.
Enjoy participating in the children's activities and watching them grow and develop.  Play is an important part of their lives.