This document outlines various extreme sports categorized into air, water, and land sports. It lists wingsuit flying, hang gliding, and parachuting as air sports. Surfing, rafting, and wind surfing are water sports. Land sports include descent, motocross freestyle, and BMX freestyle. The document stresses the importance of wearing a helmet for all extreme sports as well as other protective equipment specific to each sport. It also recommends carrying a mobile phone in case of an emergency.