H

The book Handcrafted Playgrounds - Designs You Can Build Yourself was written by M. Paul Friedberg. The book is a sketchbook of designs based on the premises that anyone can build a playground and that the actual process of the building can be as important as the finished product.

Lee F. Hanmer, sometimes called an "educational missionary for playgrounds," was influential in the recreation and playground movement early in the 20th century. Lee was an effective and industrious leader in organizations such as the Playground Association of America, the Russell Sage Foundation, the Boy Scouts of America, the Recreation Alliance, and the War Department Commission.

Head Injury Criteria is a measurement of the time duration of head deceleration during impact. A mathematical formula is used to derive a value known as Head Injury Criteria or HIC. The value of HIC with regard to the impact on a playground surface may not be more than 1000.

The World Health Organization has defined health as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." Health has many determining factors, such as social, economic, and physical environment as well as the person's individual characteristics and behaviors.

Healthy Kids Challenge (HKC) supports schools and communities in educating kids and their families to "Eat, Move, and Enjoy a Healthy Balance." This nonprofit organization utilizes school curriculum, workshops, presentations, events, and distance assistance tools, such as their website and newsletters. Their focus is on making healthy eating and active play practices become attractive, simple, and fun for kids.

The heart rate is the number of rhythmic contractions, beats per minute (bpm), of the heart. This rate is used as a measure of cardiac activity. The normal heart rate should be strong and regular without any missed beats. Measuring heart rate is an effective way to determine the overall fitness of a person as well as the presence of any medical concerns.

Gordon C. Henderson founded the Henderson Recreation Equipment, Ltd. in Simcoe, Ontario, Canada in 1971. The company offers a full range of playground equipment including playground systems and freestanding play elements, such as swings, spinning events, and spring toys, as well as site amenities.

Ernst Hermann was an American pioneer in recreation planning, industrial recreation, and playground administration during the first few decades of 1900. He also taught concerning play, playgrounds, and recreation at Harvard University and concerning the Swedish physical education system at the Sargent School of Physical Education in Cambridge, Massachusetts.

As a pioneer in the American play movement, Dr. Clark W. Hetherington was a philosopher, teacher, and physical education administrator at the university, state, and national levels. Dr. Clark W. Hetherington played an important role in defining and setting standards for the different types of playgrounds, the hierarchy of play leaders, the qualifications of playground leadership, and the organization and content of adequate training courses for play professionals.

Playgrounds are intended to be fun, safe places to take children to visit and play. The National Playground Safety Institute (NPSI), a program developed under the National Recreation and Park Association (NRPA), identified twelve of the leading causes of injury on playgrounds known as "The Dirty Dozen."

The Highlights magazine is a children's publication dedicated to assisting them in acquiring basic skills and knowledge, developing the ability to think and reason, fostering creativity, encouraging sensitivity to others, and choosing high ideals as a way of living.

Dr. Kathy Hirsh-Pasek is the Stanley and Debra Lefkowitz Faculty Fellow in the Department of Psychology at Temple University and is a Senior Fellow at the Brookings Institution.  Director of Temple University’s Infant Language Laboratory. She has researched and written in the areas of early language development and the importance of play for learning.

Holgate Toys is known for their colorful, durable, and quality made hardwood children's toys. As a division of Pepperell Braiding Company, all Holgate Toys are manufactured in Pennsylvania, making them one of the few exclusively made-in-America toy companies.

Homo Ludens: a study of the play element in culture was written in 1938 by Johan Huizinga, a Dutch historian who lived from 1872 to 1945. The title, Homo Ludens, translates to mean Man the Player.

Hot Wheels is a diecast toy car brand manufactured by Mattel since 1968. Designed as miniature customized muscle cars, Hot Wheels are built for speed and can be raced on flexible, plastic tracks.

Johan Huizinga was a Dutch historian who lived from 1872 to 1945. His book, Homo Ludens: A Study of the Play Element in Culture, published in 1938, suggested the instinct for play as the central element in human culture and examined the role of play in law, war, science, poetry, philosophy, and art.