Stuart Jeffries: Is cheerleading dangerous? According to the New York Times, acrobatic manoeuvres such as throwing women (known as "flyers") 20 feet in the air or forming human pyramids have made "knee braces and ice-bags accoutrements as common as mascara" among the US's four million cheerleaders.
Ever since the first Rocky film, fans have been running up the most famous steps in America in homage to their boxing hero. And their stories are just as inspirational as that of their idol, Sarfraz Manzoor discovers.