Cheese rolling is simple and dangerous. Cooper's Hill is almost vertical and most 'runners' actually tumble all the way down. Even the spectators aren't safe. One year an onlooker was seriously injured when they were hit by the cheese!
There are four races each year, three for men and one for women. The number of runners in each race is limited to 20 for the sake of safety. To enter just show up on the day, register and make your way to the top of the hill.