Dr. Kathleen Vaughan in her book, Safe Childbirth states that there are three basic physical needs for natural fertility:

1. Pelvic form round
2. Flexible joints (bones and joints)
3. Natural attitude (the bones, joints, muscles)

The bones, joints, muscles and nerves trajectory of the human body evolved as a running child activity.
For preschool children (the future may need to make plans for the boys and women to give children many opportunities to the development of childhood is normal). That is the opportunity to climb and overcome obstacles, open space free from traffic hazards to running, jumping and throwing.

The room in the house, where the squat for a long time, made available to pursue the development of mental skills. Facility to play within and outside the home is important to provide sufficient stimulus for the growth of mental and physical development. Reality which must be accepted that in the future many young couples will live in flats in a changing environment, without a natural open space. Natural research has provided ample evidence that ‘play’ is an important factor in the full development of young people from all species, humans and animals. Local government or young parents should be aware of this basic need to avoid serious damage in the mental and physical development of future generations.

During the school year, the facility ‘play’ there must be similar to the mental and physical development. When a child is sitting for a long time in the house will receive a lesson in physical development are generally going seriously disrupted. Running, jumping, climbing and throwing is an important basic activities of perfect physical development. This is especially important for girls because the muscles are important for this activity influence and shape the development of female pelvis.