Golf is swiftly becoming the sport of choice for physical activity that transcends age and sex. In the United States alone, further than thousands of golf courses, private and public, serve more than 28 million people annually. As well, golf is gaining popularity, particularly in continental Europe, Canada, South Africa, Australia and Japan. Golf gained a most important surge in popularity in the 20th century, with the establishment of the professional tour and television. While today's rules for golf are intricate and include a code of behavior etiquette. Golf is an outdoor game in which players use specifically designed clubs to hit a small, hard ball into holes or cups throughout a nine- or 18-hole course.