Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term cheerleading refers to the performance of athletic skills, involving dances and complex tricks, to gain a response from spectators, motivating them and promoting enthusiasm before and during a sports competition. Amongst the most well known people involved in cheerleading were American presidents George W. Bush, Ronald Reagan, Dwight D. Eisenhower and Franklin D Roosevelt, as well as singer Madonna, actresses Halle Berry, Sandra Bullock and actors Michael Douglas and Samuel L. Jackson. Today, it is believed that there are at least 4 million cheerleaders in 31 countries, the most popular sport for cheerleading being football.