速降, or "downhill racing," is an extreme sport that involves descending steep terrains on various types of equipment, such as bicycles, skis, or snowboards. Participants navigate through challenging landscapes, often competing against the clock or each other. The sport requires skill, balance, and quick decision-making to handle obstacles and changes in terrain. This activity is popular in mountainous regions and is often featured in events like the X Games or Winter Olympics. Safety gear, including helmets and pads, is essential to protect athletes from potential injuries during high-speed descents.