John Byl is a professor of physical education at Redeemer University College in Ontario, Canada. He has directed high school and college programmes for more than 30 years and has coached a variety of sports at community, school and college levels. He has authored and co-authored several books published by Human Kinetics, including 101 Fun Warm-Up and Cool-Down Games, Intramural Recreation and Co-Ed Recreational Games. Herwig Baldauf is a vice president of the Canadian Intramural Recreation Association (CIRA). Pat Doyle is a retired primary school teacher and former president of the Canadian Intramural Recreation Association (CIRA). He has authored or co-authored ten resources with CIRA, as well as Game On, published by Human Kinetics. Andy Raithby is a physical education teacher at Lisgar Public School, Ontario and a vice president of the Canadian Intramural Recreation Association (CIRA).